What You Won't Get from iOS 5 on an iPhone 3GS
Sorry iPhone 3GS users, turns out you won't get all the features from iOS5 - but fear not, as it seems that the missing features are in the minority. From Engadget:
So far, it appears that full Twitter integration and notifications are included; the newsstand and App Store are also intact, as well as the Safari reading list and grid lines in the camera. The only things we see missing so far are the photo editing features in the camera and the tab bar in Safari.
Check out Engadget for a video walk-through of iOS5 on an iPhone 3GS.