My current grab-and-go camera is the Fujifilm x100. Definitely not something you can store in your jeans pocket, but it wins out in terms of view finder and the "retro" look. The photographer has a lot of control over the camera's setting, but using it is like trying to tame a foul-tempered stallion :
Here's a rough list of the DCs people I know have and the reason why they use the specific models:
Canon S95 - small enough to pocket and still gives you good quality picture. One of the complaints I've heard is that the camera is hard to hold since the smooth surface can be "slippery" sometimes.
Panasonic LX-5 (or if u want to make a statement, the Leica D-Lux 5) - A well-rounded camera, with a decent zoom (the older model has a pretty short zoom distance). The complaint of the owner is that it's still a bit too big to carry around with ease.
(Don't know anyone who has the Olympus XZ-1, but reviews online rates seem to be overall positive)
Olympus Tough-series: This camera is designed for abuse

The user complaint is the manual organization, hard-to-come-by memory card format (I think the newer version uses the standard SD/XD card), and bulk.
My old DC is the Fujifilm F200 EXR (I think the newest version is the F550 which comes with GPS), and I love the color on that machine. However, the built-quality of that camera is not that great (by the end of its days, it feels like holding a rusting iron box).
Ricoh GRDIII: A prime that's convenient to carry and produces pretty good images. However, the GRD III has already been out for several years. Just to add, there's like a cult following for the GRD series...