Here's a list of DC Hotels I found in a Washington DC Travel Guide online at NY Times website.

The city has many excellent (and expensive) hotels, including the Four Seasons (www.fourseasons.com), the Hay-Adams (www.hayadams.com), Park Hyatt (www.park.hyatt.com), Mandarin Oriental (www.mandarinoriental.com), Sofitel Lafayette Square (www.sofitel.com), Willard InterContinental (www.intercontinental.com) and two Ritz-Carltons (www.ritzcarlton.com). The St. Regis (www.stregis.com) will reopen this fall after a makeover. Kimpton Hotels (www.kimptonhotels.com) runs several more gently priced (and funkier) properties, including the Hotel George on Capitol Hill, the kitschy 1960s-style Hotel Helix and the Hotel Monaco in the trendy Penn Quarter. For a true budget option, look at the Hotel Tabard Inn, a fairly bare-bones (some rooms share a bath) but cool refuge.

http://travel.nytimes.com/2007/09/23/travel/tmagazine/1...on-t.html?8td&emc=td

Also for backpackers and independent travelers that prefer hostel lodging, there's the Hilltop Hostel (www.hosteldc.com)in Takoma, DC.