Google desktop beta

Google desktop beta. Google for your desktop, windows only and of course when something like this comes out i’m nowhere near a windows box. Supported apps: outlook (express), aim, ie, word, excel, powerpoint. Even if i still were on windows this would be of very limited use for me, i’ll wait for spotlight.
Most intriguing: looking at the screenshots it appears that (superficially) it fully integrates with regular old google right in your webbrowser, apparently google’s really reluctant to leaving their already conquered space. Questions are, how far can you take it inside the browser, which is effectively a realm outside google’s control? Isn’t it quite intrusive to splice incoming web pages or am i missing how this works?
Of note: (i might add to this list in the future)

(Many of these links via, i might add to this list in the future)