Found Concert Live today, it's still quite a small site but has some excellent music on it. The company is based in the UK where they record concerts in high quality and then sell a limited amount of cds, vinyl, downloads of the shows. The Raconteurs, Jimmy Eat World, We Are Scientists are some of the artists featured.
The idea is worthy because it's giving high quality recordings rather than bootleg recordings which can be of quite low quality sometimes. The cds are not too expensive and it's a good source of revenue for the bands with very little extra effort on their part. Everything seems to be very well packaged and designed so I'll be keeping an eye on the site to see what other artists are featured. Hopefully more quality bands will embrace the idea.