I became interested in this category of camcorders for my nephew's Xmas gift this year. They're lightweight, compact, have fewer moving parts than most camcorders, as video is saved to internal flash memory and/or SD cards.
Unfortunately, the only camcorder manufacturer in this category to choose an out-of-the-box Mac-compatible video format was Aiptek. All the other manufacturers of camcorders in this category chose PC-only video formatting and offer no support or solutions for Mac users. They probably figure since it's an entry-level category, it's not worth the added expense.
Samsung has the most ergonomically designed camcorders (by a long shot). Everywhere I looked retailers claim the Samsung SD card-based camcorders shoot MPEG-4 video and are therefore both PC and Mac OS X (iMovie '08) compatible. However, video clips are actually saved as .AVI files, rendering them useless for the Mac, unless you can locate a third-party converter. And many of the other manufacturers are using outdated MPEG-2.
Aiptek's videos are saved as .MOV files and don't require any drivers at all.