Microsoft have stopped producing Flight Simulator, but FSX DVDs may still be found at some outlets.
An enhanced FSX is available on Steam, and Lockheed Martin have developed Prepar3D.
New Flight Sim titles from Dovetail Games will be available soon.

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 FSX and P3D
FSX-Steam Edition Developed by Dovetail Games for the Steam distribution platform, Microsoft Flight Simulator X Steam Edition (FSX-SE) offers improved multiplayer options and updated Windows 10 support, while retaining full backward compatibility. FSX Steam Edition
FSX-SE
Insider
News, updates, articles and a shop from FSX Steam Edition developer Dovetail Games who acquired licenses from Microsoft to develop FSX for a future release, and to develop it for Steam. Dovetail Games is a trading name of RailSimulator.com. FSX-SE Insider
FSX-SE Community Read articles, lesson and tips from the FSX-SE user community on the Steam web site. Steam FSX Community
Prepar3D
(P3D)
P3D is a new flight/sea/land sim by Lockheed Martin. It extends development of the Microsoft FSX platform with improvements, greater stability and new functions, while maintaining compatibility. [Flightsim Estonia's payware migration tool. Elad's freeware migration tool] My v3 screenshots. P3D v3.3 released - details.
Prepar3D
Forums
Official Lockheed Martin P3D support and discussion forums. They include specific forums for discussing issues with installation, normal and multiplayer use, hardware, SimConnect, screenshots. Prepar3d Forums
 Prepar3D Learning Centre & SDK Access the official Prepar3D Learning Center and SDK here. Learning Center offers users helpful information on aircraft, controls, navigations, missions, views etc. SDK sets out parameters for developers and describes use of built-in utilities and plug-ins. Prepar3d SDK
 Dovetail Games
Flight School
Dovetail Games Flight School will be released soon (with Dovetail Games Flight Simulator coming later). Flight School is designed to teach would-be pilots the basics of flying a light aircraft as well as the essential premises of flight simulation. Dovetail Flight School
Popular News and Download Sites
AirDailyX
(ADX)
Popular flight sim blog by D'André Newman. Latest daily news, reviews, comics, interviews and other related material on PC flight simulation from developers and publishers around the world. Plenty of comments and screenshots. Also on Facebook.
Avsim A huge and popular flight sim portal with thousands of downloads for current and earlier versions of MSFS and other flight sims. News, reviews and many active forums. Totally free. Donations welcome.
 Calypte Aviation From Poland, a nice blog by Wojciech Przybylski with news, tips, tutorials & videos and illustrated reviews of aircraft and scenery. Includes some articles on real-world aviation. A sister-site in English (C-Aviation.net) focuses on reviews, tutorials & tweaking. Calypte Aviation
Facebook - Flight Simulator
Enthusiasts 
Facebook Public Group with the usual international mix of comments, questions, screen shots and discussion. Flight Simulator Enthusiasts
 Facebook - P3D Users Group Prepar3D world-wide Closed Group on Facebook. News, screenshots, videos, questions, tips and a general exchange of P3D information and other relevant information. Over 3000 members. Facebook P3D Users Group
 FlightSim
Central
A flight sim news site. News from developers and publishers around the world, reviews and other flight simulation material. Members have the chance to win giveaways. A number of exciting new features are being developed for this relatively new site. Flightsim Central
FlightSim.
Com
The original. A huge flight simulator archive with well over 100,000 files covering all versions of MSFS and P3D. Free, fast downloads, latest news, reviews & active forums. Subscription option gives assured entry and even faster downloads. Recommended.
Fly Away Simulation Flight simulation news and reviews, downloads, forums, FAQs, navigation tutorials, screenshots and links. Completely free FSX, FS9 and X-Plane download libraries and active forums. An optional monthly or yearly subscription gives faster downloads.
 Flusinews.de German language on-line flightsim magazine largely staffed by a group of young volunteers. They carry news, reviews of freeware and payware, articles and videos. Also forum and links. Flusinews.de
FSDeveloper Community portal for add-on developers to provide a friendly place where you can discuss your design problems or ideas, whether a commercial or freeware designer, newbie or expert. Covers aircraft, scenery and FSX's missions and SimConnect.
FS Freeware.
net
Freeware aircraft, scenery and tools downloads for FS2004 and FSX. Also downloads for Prepar3D and Flight Gear.
 Google+ Communities A selection... Frooglesim Microsoft Flight Simulator - FSX Flight Simulator Hangout Community Microsoft Flight Simulator X FSX 模擬飛行論壇 Flight Simulator Flightsim Addicts Flight Simulator Network • There are others...
 helisimmer News, information, reviews articles and tutorials for those interested in helicopter simulation. Also carries a small collection of helicopter downloads. Heli Simmer
Hovercontrol Aimed at increasing the unity between the helicopter enthusiasts using MSFS. Offers forums, pilot training, excellent helicopter-related file downloads, screenshot galleries, etc.
Rikoooo A collection of freeware downloads for FS9, FSX and P3D. Includes aircraft, scenery and utilities. Also screenshots and videos. Optional, low cost, paid subscription gives much faster downloads. French and English language. Rikoooo
SimFlight English portal of a large network of useful international sites (France, Spain, Russia, Germany, Poland, Japan etc. each in their own language). Has up-to-date FS news, reviews, a large number of general and product forums, links and an on-line shop. SimFlight
Simmingly News, reviews, videos on all categories of flight simmimg including information on FSX, P3D and X-Plane commercial and freeware products. Simmingly
Simviation Many gigabytes of quality freeware add-ons nicely organised by type. Includes aircraft, panels, scenery & utilities. Also offers help with installing them, news, reviews, VA message board and more.
SurClaro Flight Simulations Large, long established flight simming resource offering thousands of freeware and shareware downloads (free registration required), forums, chat rooms and screenshots. Also hosts an on-line shop.
V-Aviation.net Founded in October 2014, we strive to provide you with daily flight simulation-based updates and content from editors and software publishers from around the globe. Breaking news, exclusive content, reviews, screenshots. V-Aviation
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