2007 was another great year for inventive mash-ups, and the usual suspects have emerged with best of compilations for free download. If you've been neglecting your recommended daily allowance of mashups, there's no better time to catch up, so put that high-speed connection to the test and fill your iPod with some illegal music.

First, there's the always reliable Annual BootieUSA compilation Best of Bootie 2007. This is the premiere compilation, in my opinion.

The fine folks at Mashuptown.com have compiled 30+ of the best mashups from 2007 here. And if you missed last summers' Iron Maiden mashup album be sure to grab that as well.

Simon Iddol has compiled an excellent 19-track CD of his 2007 favorite mashups.

DJ Earworm has created a 5 minute mashup out of Billboard's Top 25 Most Popular Songs of 2007.

Culture Bully's 15 favorite Mashups of 2007 is another excellent collection.

Stereogum and Team9 present MySplice 2.0: 2007 Mashed Up.

I can't wait to see what these brilliant producers come up with for 2008.