Install AppBrain from the market.
Have a look at my list: http://www.appbrain.com/user/dirk1978/apps-on-the-samsung-galaxy-s
Pick what you like and tick stuff to add to your own list.
Open AppBrain on your phone and choose to sync.
Ask your friends who have Android to share their AppBrain lists and choose apps from their list.
I recommend:
Angry Birds, Official eBay, Torque, SpeedX, Tasker, LauncherPro, ADW.Launcher, Sky Map, YouTube, AmazonMP3, Movies, Quadrant, Tweetdeck, Winamp, Sky Remote Record, Rainy Days, Kindle, IMDB, Premier League Buddy, Google Earth, Chrome to Phone, Air Control