There isn't a whole lot of choice actually, at least for the specifics you mention (and depending on how you define "compact"). Mostly because the 'larger sensor' requirement you have, which is a decent requirement, but is met only by a small few cameras.

Everything is compatible with Iphoto, it simply needs to have JPEG ability, they all do.

If your budget is waay flexible, you may want to look at the Leica M8, but - thats more than almost all DSLRs already. You'll get great quality and can pair with some great lens, but this camera was really only built for the very wealthy (body retails at some $5K).

The Sigma DP2 has the larger sensor too - and dont be misled by its '4.64 MPix', thats fovean so its equivalent to 14. Also a pretty expensive option (~$700), but a good one no less

The Sony R1 is still the best bridge camera yet built, but it is pretty far from being 'Compact' (unless you compare it to DSLR). It also does not have an image stabilizer, but it does have the best lens of any bridge camera or point and shoot.

The most popular choice for what you're looking for would be in the Canon G Series, it is the compact sidekick to most pro's gear, and unless you specifically are looking for a large sensor, this is probably the best choice. There are heaps of people on this forum who use the Canon G series (G9/G10), all of which would be a good option. There is now the G11 as well, which has a lower mpix sensor @ 10Mpix (a good thing), a tilt swivel LCD, ISO range 80-12800, etc.

The G series is most likely your best choice. If you're a millionaire though I would go for the Leica M8.