Can store 1360 6MPixel pictures or 30mins or 640x480 video at 30fps with sound.
That a Fuji cam?Going a lil off-topic, but I'd always recommend shooting in RAW format if your camera supports it. Gives you the advantage of being able to modify the exposure time, white balance, hue, saturation and everything, after you've put the pic on your PC. You can generate three images with different exposures and do some pretty spectacular HDR processing from there. (Although to be fair, JPG is probably fine for holiday snaps and the like.)
Downside is that .RAF format files are 4x larger than their JPG counterparts. But still, 340 pics on one card isn't bad. I managed a whole wedding shoot recently on a single 1GB xD card @ 4mpx/RAW format.