My dream concealed carry pistol is a Barrett M82. It's not terribly good for concealment, and it gets heavy by the end of the day, but it scores top marks in every other category.
Birdman Weapons Systems had a compact Barret. It was some of the funnest gun spoof on the net. http://www.google.com/search?q=birdman+weapons+systems&hl=en&prmd=imvns&tbm=isch&tbo=u&source=univ&sa=X&ei=eZ1DULb1GrT8yAGnxYDYCA&sqi=2&ved=0CB4QsAQ&biw=1280&bih=670
Over penetration can be a bitch, though.
Hey, I have that one! I use an ankle holster for concealed (sort of) carry....