OK, I may be missing something here, but this seems like a stupid idea.
Basically, they're saying you can maintain an "offline, cached" copy of a portion of the internet on your computer. Again, if you know ahead of time you may need information from a travelsite, etc., then this may be useful. There's been software to do that for a long time.
But (at least for me) I find that much of the time I'm actively searching sites that use databases to dynamically present information on the page.
I liked this quote from Webaroo's website:
"It's fast -- searches run and pages load instantly at memory speed"
I'll wait for the version that searches at ludicrous speed.