Justin Ouellette’s Muxtape site is a great (and easy) way to share 12-song mixes with people. Its legal standing seems a little cloudy at present, although Ouellette states: “Labels big and small have told me that they're excited about Muxtape as a model for discovery and ultimately selling music.”
The simple interface has undoubtedly made Muxtape an attractive proposition for users, although there are a few features missing. Ouellette says in his tumblr blog that M4A/AAC and last.fm support is coming, but there’s no sign of a much-needed search engine. Enter Muxseek, the ultimate Muxtape search site. Muxseek offers a simple interface that allows users to search by artist or song, taking them to a list of appropriate Muxtapes.
This is a Muxtape I made a while back. I particularly recommend the R. Crumb track, although it's definitely not safe for work.
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Muxtape is great but the creation of Muxseek makes it even better.