It's basically an updated version of the Treo 650, except for the tech/spec minded, it's radically different. First, it's got 128Mb of built-in memory, it runs Windows Mobile, I jacked it from WM5 to WM6 using vp3G's WM6 v3.0 ROM. It's got a higher res camera, 2M pixels, HSDPA networking, which works great here in Austin, it does video/MP3 etc.
However, the fun part is after a bit of playing around, I've worked out how to get Realplayer on the HTC to play the BBC Radio London radio station to play. It's so much fun, for me at least. I plug it into the BOSE Stereo I have at home, into the car stereo etc. It's so weird, using a phone, normal retail price $650, billions dollars of investment in the Internet, I've turned this all into a $15 portable radio from the 70's!
If you have a phone that does Realplayer, check out this link, it has pretty much everything you'll need, apart from that is either an Internet capable phone, such as the Nokia N95, a Windows mobile or Palm based PDA.