Biden is an awesome choice from a long term perspective. He has been around long enough to know DC inside and out and absolutely fills out the ticket regarding Obama's weaknesses. The interesting thing about the choice though is he doesn't do what the VP choice has done for the various tickets recently - bring some aspect of the voting public around. For example, Edwards being picked in 2004 was to help bring the blue collar southern working vote. Biden is from Delaware, that isn't exactly a huge electoral state.
I'm glad Obama picked based on long term considerations rather than short term ones.