Generally, The number after "IMG_" in the file name dictates the number of shots you've taken. This number, however, won't help if you've resetted your number count. I don't keep count but I'm somewhere in the 6k range and I've had it since it was released.
Well, I frequently unload my 2GB SD card onto my PC. I found some recent ones I took and it appears I'm over the 2k mark. Then I also found a few of the first pics I took with the camera and the numbers started at over 800 so I don't know how that happened. Not a big deal though.






