Links from a kuro5hin.org article with Links to Tens of Thousands of Legal Music Downloads.

iRATE radio (What is it with the “i” in front of everything these days?) This is a collaborative filter (think Slashdot-style moderation, except applied to mp3s instead of articles) that spiders legally free mp3s, tailoring things to your taste using statistical analysis.

spamgourmet, offering self-destructing e-mail addresses, to prevent the accumulation of spam.