First noticed by Mashable commenter Joseph Morin, the account seems to have been launched shortly after his interview with Kevin Rose on the Digg Dialog. While it's certainly taken him a lot longer than the next day turnaround he promised back in September, he's on now and posting links to his blog and general goings on.
He's definitely accrued a boatload of followers in his first day on Twitter. As I'm writing this, he's up to almost 5,500 followers, though the only follower he's reciprocated for so far is the corporate Current account.
It's fairly hard to tell at this point if Gore is going to follow suit with many his fellow political tweeters and have interns and staffers handle the account or if he's going to handle it himself - the current tweets on the account don't give much indication either way. Certainly, nothing at the moment resembles anything Valleywag predicted it'd look like a couple of months ago.
While I doubt we'll see anything as salacious as what Valleywag suggests should he handle the account himself, it would be interesting for folks on either side of the political spectrum to get a peek inside the general goings on of the former vice-president. While he certainly is going to attract a following as is, I know folks on the other side of the fence like me aren't particularly interested in subscribing to a bland propaganda channel.
If I know there's a person behind the words, rather than a vetted and edited 140 character description of some link he wants to pimp, I'm more likely to pay attention, and that's sort of the point of social media in general, and Twitter in particular. If there's anyone from the political sphere who could understand that, it should be Al Gore.