Magnum Research Baby Eagle (MR9900). It's a hefty, all steel piece, but VERY slim. It conceals very easily in a quality IWB holster, such as Tucker Gunleather's 'Texas Heritage'.
My new 'baby' though is my Beretta PX4-F in 9mm. It's wider than the Baby Eagle, but weighs in at only 27 ounces. I love the 17+1 capacity. I got to fire a friend's this weekend (I STILL haven't been able to get mine to the range) and it was incredibly accurate with extremely light recoil.
I watched him put a couple of hundred rounds through it, with only a cursory cleaning before firing, and it ate them all. We put 100 rounds American Eagle 124gr FMJ, 100 rounds Winchester White Box 115gr FMJ, 50 rounds CCI Blazer 115gr FMJ, and 40 rounds Federal 124gr Hydra-Shok JHP through it. There was not one hickup throughout the entire session.
Like I said, it is a bit wide for a carry pistol, but I was able to conceal it with an el-cheapo 'Uncle Mike's' holster. I was wearing dress slacks, a dress shirt, and a tie, and the spare tire around my gut normally makes concealing a difficult thing.