Rolling Stone has just declared the Who show on 11/12/1999 at Chicago's House of Blues as their best ever concert in the post-Keith Moon era.
I was there, and I agree. I'd rank it as one of the best shows I've ever seen. (I still can't believe Bridget agreed to let me pay $300 to see the show. I've never paid that much before or since)
Check out the article. It has the bootleg audio of the entire show. If you don't want to listen, you can still check out the full set list.