I have a 1GB XD card, never filled it up -- once offloaded 300+ HQ-3072x2304
Power
Eats batteries. Keep a steady supply of AA batteries available.
Doesn't live well with the 1.2V NiCad rechargable AA batteries.
Flash eats power quickly; red-eye even more quickly
LCD isn't too power hungry, but turning it off extends battery life
Macro mode
Mode-1 lets you zoom; Mode-2 doesn't
Resolution
adequate point-n-shoot in auto, auto-flash, HQ-3072x2304 (printable 4x6 pictures generally); this is the mode I leave it in for my wife's use since it will usually do a "good-enough" job of what she wants to shoot
SHQ is better than HQ; JPEG artifaction is pretty bad with high-detail HQ pictures
use SHQ if you are going to post-process even a bit or print above 4x6
Flash
Red-eye is pretty bad with this camera
fixing photos in software is generally more power-friendly
This is a collection of techical information, much of it learned the hard way. Consider it a lab book or a /info directory. I doubt much of it will be of use to anyone else.