Gridskipper

The Washington Post is hosting a pretty slick Google Maps mashup that calculates route and estimates fare for a DC taxi trip. Not only does it give you the cost under the city's current zone system, but it gives you a trio of estimates (varying by travel time) using the new metered-fare system, which takes effect in April. You can enter addresses or just drag & drop the route endpoints; you can even reverse the route to see how one-way streets affect things. [WP]