If this really works, it transforms the world of email -- and may be the step that will finally liberate me from Outlook and its gigantic, touchy PST files: offline access for Gmail. Report in the official Google Enterprise blog here. Early report from Network World that alerted me to the development here.
I have, alas, enough real-world, late-on-deadline, day-job writing ahead of me in the next 24 hours that I don't even have time to check this out and see how it works. There will be much more to say later on about what this means for "cloud computing," for desktop apps (like Outlook), for Google's plans, and all the rest. And I certainly will try to get it applied before my next long plane trip not long from now.
For the moment it is sufficient to say: Check this out!