Last week Shawn Blanc linked to John Mayer's live album and Film- Where the Light is. For the most part, guitar players already know that John is the real deal, but this album really shows it.
I bought it the day it came out back in 2007 and it has been in constant rotation ever since. I loaned out the DVD that came with my original disc and it was unfortunately lost.
Thanks to Shawn's link, I picked up the itunes version again and have been letting it play on my iPad at work while I work. The audio version is great too, but the video has all the in-between banter between the band and the audience.
You can also watch it on YouTube here. I like having my own copy.