I'm a Chrome loving geek, but I'm far outnumbered by the non-technical, non-geeks that I've converted to Chrome based on its superior security and stability.
Among my friends, that's step 1 when you get roped into doing family tech support anymore: remove the IE shortcuts, install Chrome. Only sometimes changing the chrome shortcut to the IE icon...
I have been playing with web workers (http://github.com/revis/Really-Cloudy) and one thing that worried me was the number of people with capable browsers. From your data it looks like that isn't a problem for technical audiences.
Browser usage on Mibbit main client (Snapshot):
Chrome has really grown at an astounding rate in the webapp usage world at any rate.