We have announced that we are going to be supporting the Blackberry and iPhone app store in the future. Sadly, getting through the requirements for the iPhone App Store is taking a little bit of time, but hopefully soon.
We hear this all the time. The more people use the service/portable, the more they seem to like it.
I hope you make app for the Android OS too. I just recently got myself the T-mobile G1. The only thing they have now is Imeem and compatiable program for last.fm.