The first thing I checked with Google Chrome running multiple tabs is how it appears in the Windows Task Manager. Sure enough, each tab is its own separate process with resources allocated in Windows. According to the Google press conference, plugins running within those tabs will get another separate process. I can see an awful lot of Windows processes going at once with typical busy web sessions.
I still not sure if this is a good feature or not. In IE or Firefox if one of the tabs crashes the whole program crashes, in this case I'm not sure but if it crashes only that particular tab and the other tabs still good them it's a good thing.
Google Chrome can be downloaded here.