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!"
Personally, I have a cingular phone for personal use and a Nextel for work. I'm a net admin for a public school district and I can say without a doubt that PTT is the way to go in business. The nextel is the easiest way to cut a 2 minute call/conversation into a 30 second Q&A. As far as the phones are concerned, EVERY model has the ability to disable the speaker by the push of a button and most models can be set to vibrate instead of beeping for incoming PTT. This obviously works well in a meeting or in public. Typically I set mine to vibe and i get beeped - I know it but nobody else does and I leave my speaker off so if they blurt something out nobody hears it. The majority of PTT users are just plain rude and think its cool to have their friends yelling at them in public. As far as the nextel SERVICE is concerned, coverage blows here so we'll be switching to Cingular PTT in the spring. I can't wait to have a PTT provider that works everywhere here instead of the "turn around and drop signal" nextel coverage - yes it's really that bad here (in MO).