If you're looking to pick up a digital camera but are not the sort to lug touristy-type paraphernalia around, consider an Exilim EX-S2 "Wearable" Digital Camera.
This digital picture snapper is a little thicker but otherwise no larger than a credit card--it's literally "pocket sized." The EX-S2 contains a batch of technological advances in CCD (the lens), CPU (the brain) and Flash memory (the digital "film"), so it doesn't sacrifice performance for sleekness.
Its 2 megapixel resolution makes for fairly decent snaps (professionals prefer 5 megapixels or better, but such cameras are bulky and cost $thousands) and comes complete with rechargeable Lithium-Ion batteries, which are recharged in the same, convenient USB cradle that connects it to your Windows XP PC.
Bearing in mind that you're paying something extra for pocket-friendliness, you might just as well spend the same amount of money on something slightly more powerful, though slightly larger and not as pocket-able, like FujiFilm's FinePix A303 3.24MP digital camera.