I've since updated that number in Betabeat with the figure from tonight's NYT article, which says Uber planned to launch with 105 pre-registered cabs and plans

I've since updated that number in Betabeat with the figure from tonight's NYT article, which says Uber planned to launch with 105 pre-registered cabs and plans to add 100 a week. (The initial, incorrect number was what I had when I broke the story this afternoon, and tried to confirm with Uber. Apologies for that.) Agreed though--it's going to be really interesting to watch, with each player having a corner of the market. There's also Taxi Magic.