Several of you doing that wish list meme have included doing a day at the spa as one of your wishes. For those in the DC area, here are some links to help enable your spoiling.
Both in Berkeley Springs, WV
Atasia - this is an awesome place for pampering, whirlpools built for two, great massages, and all sorts of other relaxation treatments you can get. It's hard not to like a place that has a Serenity Room.
Berkeley Springs State Park - also has massages, cheaper and less fancy than Atasia, but they do have these Roman style baths that are really neat.
I recommend doing both, a whirlpool and massage at Atasia and then take a dip in the hot spring-fed baths.