Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
As a long time Blackberry user and current PocketPC user, let me just say that this won't kill Blackberry. If all you want is email (easily), Blackberry is about the best. Its simple, and just works. If you want to do just about anything else, its time to look at some other options.
My company builds some really versatile software for PocketPC {shameless plug}, but I was a PocketPC user even before I started here. I like being able to install software to do just about anything I want. I like watching videos, listening to music, IM'ing, and all the stuff that Blackberry is behind in.
I don't think Blackberry will die until people start REALLY wanting a small scale portable PC-like device. Hopefully that will be soon.