Let the hive mind of Engadget get that for you.
"We need a digital camera that can be switched on and fire off that first shot fast. It's not a commonly tracked statistic on any review site, and nobody seems to have this information for every camera. We were hoping other readers could inform us as to what small digital cameras can fire off their first pics in under a second (ideally under half a second). It needs to be small, but mostly, just really quick in operation. Thanks!"
I do wonder where the Math Blaster or Oregon Trail games are for DS/PSP. Even GBA doesn't have that much edutainment software, IIRC -- it's all either big-kid (or grownup) games, or Barbie/Lego/Bratz/whatever. Brain Age is beyond a 4-year-old, so I guess Leapster saw a gap in the market and jumped right in there. Good for them, I say.