I've often posted about the great mixes found over on the Never Ending Internet Mix Tape and always enjoyed dropping by occasionally to pick up what they had to offer. Recently they redesigned the entire site and now give reason to visit much more frequently - as the two authors volley back and forth with musical reactions to prior picks. Every 15 songs they package it up into a downloadable mix but now you can follow along in the process. Just start at the bottom of the page and work your way up, I'm willing to bet you enjoy it.