email and the RED LIGHT NOTIFICATION!...and I love the chime. Also, browsing the web in its natural state. Was able to watch The NBA All Star game streaming LIVE here in Amsterdam.
Just kidding. Portability,Multitasking, and also the Notification light. I really like to just peek at the PB and know I have a message. Oh yes I forgot,Docs To Go..
I have to pick just one? That's not fair. There so much to like in a nice package. If I have to choose, it would be the Bridging. It makes my BB phone experience much better by letting these old eyes not have to strain to see the screen.