I'm not wild about Biden, but I'm coming to like him. But what's terrifying is that I think Joe Biden is a decent proxy for the hard-nosed, Irish Catholic Democratic pol that was on the last winning Democratic ticket: Santos-McGarry.
The West Wing's predictive powers continue... spooky. I just hope Biden doesn't suddenly have a heart attack.
Update, with substantive thought: Okay, this is where I'm at as of Saturday evening: Joe Biden is, by all accounts, one of the Democratic politicians most qualified to be President, if we picked them based on actual competence with policy and knowledge of substance -- that is, if they didn't have to run for election. Meanwhile, he's also (with some notable very bad exceptions) a decently progressive politician (see Violence Against Women Act, others.) So actually, the Vice-Presidency is one of the best possible places for him: he's in the executive branch, where he can influence policies that he's most knowledgeable about, and he's been removed from the Congress, which is also possibly a good because he's no longer able to shepherd awful bankruptcy bills for his MBNA overlords. (Remember, he's still only the Veep if he wins.)
He is both a campaigning choice (already, he's lacing in to McCain) and a governing choice (unlike Edwards or Lieberman, but like Al Gore.) On balance, I approve.