definitely go see
the redwalls. i just saw them friday night -- they're awesome. they're on student-run drexel university label
MadDragon Records (that's my friend ashley holding up the sign -- she was responsible for putting together their show on friday...i'm pretty proud of her).
apart from those already mentioned, may i suggest...
Nicole Atkins
Ben's Brother (dentyne ice uses their song "stuttering")
Rocco Deluca and the Burden (i cannot rave enough about them)
Sonya Kitchell
My Morning Jacket
Kate Voegele
also, i've been meaning to tell you to check out local philadelphia band
jealousy curve (currently touring the south before finally coming home on friday!!). apart from being a great bunch of guys, they're out of this world performers. they did an acoustic show not too long ago and covered purple rain. i died a little. check them out...you'll dig