Best place to download stuff! Wide variety of FS stuff. Not only MFS, but others as well!
Nice place, but with no good search feature. Has some nice tutorials.
Great place also. But limited stuff.
If you can even get logged in, theres a huge variety of stuff. I think it has a ton of BA aircraft, but use of it is limited because it so hard to get logged-in.
THE best place if you love heavies, like me. High Quality airplanes: 747, 767 (New GMAX!), 777, A330 (New GMAX!) and with 737, 757, and A340 coming soon.
Another good place, offering the MD-11 and the 717.
They currently only offer the A300-600 with four liveries, several Russian aircraft, and a POSKY 767 painted in special Gulf Air colors, but their superb A320 (from screenshots) are coming quite soon! (Heard that more than 80 liveries have already been painted)
Historic Jetliners Group, offering old aircraft such as the 707 and the 727.
Great site to download L-1011, DC-10, KC-10, and 757!
A great site with the A330, A340, 777, and A380! It's A380 version 2 is quite nice, with a wingview. But aircraft quality is lower than other sites.
Phoenix Simulations Software (PSS) A320 http://www.phoenix-simulations.co.uk
Wilco's PIC 767 (Don't know website)
Dreamflight 737 (Don't know website)