Go to settings>Applications>manage applications. Select menu>filter>downloaded. What kinda apps you got? Any that you can't live without?
Advanced TAsk killer- nice
AK notepad
Alarm Klock - cant live without.
App Brain - a given
Bubble - not useful at all, but maybe some day
Coupons - not used a coupon yet
Dex Knows- handy for looking up numbers for businesses, addresses, etc
Dictionary.com
earth
ebay
facbook - everyday use
handcent - much better than defailt message system
maps
market - obvious
mini info
movies - handy for movie showtimes, dvd release dates and trailers
paypal
qik
radar now
scanner radio
shopsavvy - use to scan QR
tv guide mobile
world newspapers