I personally think that the Facebook app is quite cool and useful.
Other than that, not having to pull out my laptop while traveling in order to check my email is "cool" in my book. Isn't that the main purpose of the BB?
It sounds like you may need to switch to a Centro or something since Palm OS has a ton of third party apps available.
the vibrate feature is pretty cool, you can have some fun with that
you beat me to it!!! No for reals though... browse the internet, watch youtube, take pictures, meet and talk to people on bbm or one of the other programs you can get! walk around and show it off! Go up to your friends and be like "i see you have a crappy phone, you should try bb cause i love my phone" blah blah blah
They can be especially fun to text while driving because it's easier if you use both hands to type on the BB. Driving down the highway with neither of your hands on the wheel can be a **** of a lot of fun.