For my summer holiday trip this year I took the G10 and the 350D (Rebel XT).
The G10 did a pretty fine job, I have to say. Obviously, it didn't do everything the SLR would do, but it still did well.
Have a look at the trip report here -
http://www.disboards.com/showthread.php?t=2268415 - the first day was all G10; other days were a mixture (the pictures contain all fo the EXIF information to tell you which was which camera. If you can't tell the difference, that probably says a good thing about the G10!)
Only problem is that it's not an easy camera to carry around - there's nothing to get your fingers around when you're casually carrying it.
regards,
/alan