Give a look threw the Aftermarket software forum.. Must have Apps are on a user to user basis...
Also depends what you wanna do with your BB, whatever I want my BB to do I make it do
WeatherBug Direct, Viigo, Cram, Data Vault, Texas Hold'Em, my list goes on quite a bit
I'll update it later.
(How many smiley faces can I fit in one post... wow)