Ok now im home let me give you some exact detail (all of this is from the istat pro widget and not messing with fan controls. For the MBP in my sig.
Safari only open (1 Tab)
Cpu usage 0-1% on this page typing this
tem is 38 degrees celsius
Safari (2 tabs)
1 is this page other is a youtube vid 720p
usage 9-12%
temp is 44 degrees celsius
Safari (2 Tabs)
Youtube vid 1080p vid
usage 15-19%
Temp 54 degrees
Safari (3 Tabs)
2 different tabs playing 1080p videos
usage 25-30%
temp 60-65 degrees
Safari and Itunes (itunes opens in 1 hop)
1 tab this page 1 tab playing 1080p video
itunes is in music library
usage20%
temp 60 (cooling down these tests are bign done simultaneous giving a few mins to measure a stable read)
Safari an itunes just browsing 0-2% usage
temp is 50 and cooling
Safari + itunes
Quick open 10 tabs and loading random pages
usage went from 25% to 4% (once done loading)
Temp 50
(so far not an ounce of lag during the tests or loading pages.)
Safari, Itunes, App store, Ical, Address Book, Iphoto, Word, Excel, Steam
(all open and running)
spiked as each app opened but is hover around 3%
temp 48 degree
well i cant think of what else to try any requests just ask.

glad to help! i will try and do some gaming this week and get FPS captures but all the gaming will be in osx i do not use bootcamp and have no desire to i have a windows machine for that.
I was playing TF2 last night on native resolution with minimal lag the temp was around 80-85 when i finished after over an hour of play.