DiscLive is an exceptional, obvious idea:
DiscLive offers fans the ultimate opportunity: a chance to take home the show you experienced on CD, just minutes afterward. No longer do you have to suffer through poor quality and outrageous prices to remember the shows you attended.
I’m a collector of live and bootlegged music, so I think this is a great idea. I was so pleased when, last year, I found a recording of a Cowboy Junkies show I’d attended in 1996. I know that Pearl Jam did this with their tour last year, releasing live CDs of every show. Of course, many bands would be reticent to do this, worrying about brand-quality and all that bollocks.
DiscLive has a truly meagre set of bands so far (Billy Idol? Jefferson Airplane?). Is there a more popular, similar service? These guys can’t be the market leaders. Thanks to Coudal Partners for the link.
DarrenBarefoot.com 
Hey! Billy Idol & Jefferson Airplane rule!
It’s a nice day for a white rabbit?
Clear Channel is working on something like this, but right now it’s only for unsigned bands, and is being test-marketed in the Boston area, as I recall. The only links I had for this are now expired.
In the meantime, we’re stuck with downloading the stuff:
http://www.archive.org/audio/etreelisting-browse.php?collection=etree&PHPSESSID=65bf3abc10e03b417bd10f5b7fe3f6c0
Not so bad with a broadband connection and some free time. I love the O.A.R. stuff, and am enjoying Virginia Coalition from there, too.
-Augie