I've been to Baltimore many times now.
The light rail is connected directly to BWI, and it goes downtown. It takes about 40 minutes; it's pretty slow, and broke down when I was on it on November 8, 2006.
723 Saint Paul Street Baltimore, MD 21202 410-344-7479
Stayed there November 8, 2006. In Mount Vernon district about a mile north of Inner Harbor. It's in an excellent location, and it's the cheapest hotel in the area, but it's decidedly mediocre, possibly slightly worse.
1106 N. Charles Street Baltimore, MD 21201 410-547-6925 email@example.com Hours: Mon-Sat 4:00pm - 2:00am Sun 5:00pm - 2:00am Full Dinner Service Starting at 5:30
Recommended by Donna's husband on January 25, 2009. Supposed to have excellent Belgian beer and up-scale pub grub. Haven't tried it yet.
1002 W. 36th Street Baltimore, MD 21211 410-243-1230
635 East Fort Avenue Baltimore, MD 21230 410-727-5769
1105 W. 36th Street Baltimore, MD 21211-2507 410-889-8891
Faidley Seafood (at the World Famous Lexington Market)
203 North Paca Baltimore, Maryland 21201 410-727-4898 Hours: M-Sat 9am-5pm
734 S. Broadway (@ Lancaster in Fells Point) Baltimore, MD 21231 410-327-5795