Dan,

Have you looked at Slimserver? I love using Slimserver with my 700. I'm able to stream my whole 60+GB MP3 collection to my 700 with complete control. No uploading. You can browse by genre, artist, album, album art, and you can create playlists on the fly.

I set up a DDNS address for my home PC so that no matter where I am (or how many times Verizon changes my IP) I can get to my collection via the same URL. One of the Slimserver users has created a nice skin for the 770.

The interface is peppy even though it doesn't use AJAX.

I forgot the best part... it's all FREE.