I got to enjoy some of the spring weather this afternoon while 
inspecting a construction site on the southwest side of BWI (technically 
Patapsco SP).  Not glamorous, but I'll take any outdoor "work" I can.  
Below are a few notables:

1 Northern Parula
2 Yellow-rumped Warbler - sporting their brilliant spring plumage
2 Pine Warbler
7 Palm Warbler (all yellow)
1 Louisiana Waterthrush
Also had 2 sharp Savannah Sparrows, both kinglets and a gnatcatcher.

shot of one of the Palm Warblers here:
http://www.flickr.com/photos/odephoto/2405762865/

Cheers,
Steve Collins
Towson, MD