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 love this form factor. I still don't understand why Nokia never did a US 3G spec E90. Touchscreens are nice for the kids but serious work needs a Qwerty and something that won't be destroyed it I happen to put it in the same pocket as my car keys.