Car service Uber, which started just 18 months ago, debuts in Washington D.C. today, hot on the heels of its recently-closed Series B funding round and its official global expansion, which started with Paris earlier this month and will continue at a pace of two cities a month in 2012.

I’ve studied the company and the market opportunity from various angles before, then I finally got to try the service in San Francisco, coming away very satisfied. (You can read more about that experience here.)