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Effective September 1, 2009, cost for Economy Parking is $9 per day (one day equates to each 24-hour period). Cost for a taxi will depend on how many miles it is from your front door to the airport. Yellow Cab charges a $3 pick up fee, and fare will be about $2 or so per mile and most charge a waiting fee of 40 - 50 per minute. In addition, some cab companies will ding you 35 - 40 per mile if your trip is under a certain number of miles.
A cab from Dulles was usually about $55. Part of the problem is that traffic into the city from Dulles is horrendous. I once took a flight to Dulles from Chicago and it took me longer to get into DC from Dulles than it did to fly from Chicago.