I love my apps on my blackberry 8900..I use all the same for my unlocked storm 9530. My storm stays at a stable 22-24 million with these apps and 8900 stays at around 120 million with all the app too both batteries hold up well with all the usage.
Facebook
Myspace
AIM
Windows Messenger
Tweet Genius
Poynt
Where
BT Sidekick
Score Mobile
Blackberry App World
Slack Radio
Crackberry Launcher and App Store
Weatherbug Direct
Calorie Counter
Viigo
and a few others