Great place to host your mixes...

[djscrizzle]

Ive used them since March. They're great about their file download/upload times.
http://www.house-mixes.com/

[budros]

good lookin' out, great topic

i recommend

www.soundcloud.com

[superchibisan]

sundcloud has a mucho professional feel to. the streaming option is where its at yo.