Don't use google accellerator to browse any sites that require log-ins, ESPECIALLY if you have moderator or administrator rights.
There is a bug that will automatically log in anyone who visits the same site after you using the accellerator using your account.
I haven't seen an article about this anywhere, but there are several posts in the web accellerator google group about this topic.
It's confirmed to happen in phpbb messageboards, I don't know which other blogs or forums this can happen to.
update, changed the link to a something awful example showing the problem in their forums.
I'd suggest uninstalling this software immediately.
Something Awful forum post with more details