Either this: Ultra portable with good ISO performance: S90

or

G11

Quote from: http://www.laurencekimblog.com/index.php?category=16

What about micro four-thirds?
The Panasonic GF1 and Olympus PEN are really interesting cameras. Much larger sensors than the G11 with bodies that aren't much bigger. If I had an unlimited budget, I would buy one of them today, just for fun. However, in the end they wouldn't really suit my needs. Put the zoom lenses on them and they're pretty big, certainly too big for a small belt pouch. That disqualifies them for me as take-everywhere, always-with-you cameras.

Conclusion:
My G11 will serve three functions: as a macro camera for weddings, a vacation camera and as an always-with-me camera for casual snapshots and videos of my kids. Professionally, the only time I would consider using it would be when I needed to overpower bright sun with off camera flash using ultra-high speed sync. It's either use the G11 or buy/rent $20,000 worth of high-powered lighting gear.

Landscapes, macro or portraits, there's really nothing this camera can't do. Detail is amazing. Any one of these images would have sufficient detail to print a double truck magazine ad, no problem. In short, the G11 is the best small-sensor compact on the market today.