I was lucky enough to catch the Up In Smoke tour back in 2000. That had Dre, Snoop, Ice Cube and others. I've gotta say that was the BEST concert I've ever been to.
My favorite however was when I caught DJ Quik at the Hollywood HOB back in the summer of 2002. I even got a little segment on the Visualism DVD if anybodies ever seen that.
Recently I got to go backstage at the Tech N9ne concert here in Oregon.