Discogs Turns Record Collectors’ Obsessions into Big Business
nytimes.com
nytimes.com
I've always been a big fan of their transparency and support as well, you can get downloads of the entire database, freely available, on a regular basis with no hassle. They know it's not about the data, but the community and experience.
Weird seeing them on HN, seems like 10 year old, moderately profitable companies aren't as common around here.
The CD booklet Google.