42% Of Mac OS X 10.6.5 Security Updates Were Fixing Bugs In Adobe Flash
cultofmac.com
cultofmac.com
"Add in the fact that on the new MacBook Air, merely stripping Flash from the default OS X install adds two hours to the battery life"
I'd like to see this test replicated with some other technology filing in the gaps that Flash leaves when you remove it, otherwise this means nothing. Of course doing less will used less power. I suspect playing a video while browsing the web would have a similar (how ever probably slightly less significant) effect.