If it's Clapton video you're after, the 2004 Clapton Crossroads Festival has some really great stuff - especially late in the second disk, with Blues in C, and a version of Rollin & Tumblin, or Possession over Judgment Day - whatever it's called on that take.
The 2007 Crossroads festival isn't as good, perhaps, but I've only seen it once so far. The Blind Faith stuff with Winwood, especially Had to Cry Today, looks pretty great.
On Clapton's CDs, the MTV Unplugged session is first rate, with four or five real keepers like Hey Hey, and Malted Milk. Also, the Me and Mr. Johnson CD is pretty good, although I like the live and acoustic stuff better.
One more thing, if you like great blues, you simply have to check out Joe Bonamassa. His Blues Deluxe CD makes me wanna quit playing guitar, or quit work and play all the time, either one! There's some cool video of him here:
http://72.167.28.71/