Since Google Maps upgraded their Maps API to V3 and V2 has been deprecated it rendered the tool useless for sometime.
I would like to announce that I have upgraded the Google Map code and it is back online now. No need to re-download the tool the version you have will work fine. Just close your ArcMap and relaunch it again.
For those wondering what's Arc2Google, Click here to read and download Arc2Google for ArcGIS 10.
Shoot me an email for any help or suggestion.