Ok, then we know of at least of 2 people addicted to GoogleSky: you and me, at a minimum!
Currently, the "Where is Hubble Now" layer simply assumes you are at the center of the earth with no horizon, like the rest of GoogleSky does for astronomical images.
At STScI we are working on extending this layer to do:
a) given your IP or your position on the planet, we will generate a layer that will show you Hubble "greyed-out" when it's not visible from your location. This will still assume no horizon.
b) an addition to the current layer that will tell you what part of the sky Hubble is observing now, including information on the observation being carried out.

We are also planning on adding other satellites for which STScI had data in their Multimission archive, such as GALEX, FUSE, etc...

We will post both to the community and at our own site: http://hubblesite.org/explore_astronomy/gsky/

Ciao