Joined: 01 Jun 09
04 Oct 10 2:02 am
That happens when you, and/or someone using your internet connection, have been doing a LOT of searches. You have reached your limit on google (they don't say the actual number of searches, by the way, so I cannot tell you what the actual limit is). This can happen whichever SEO research tool you use.
Another fix is to stop using SEO Quake and any other SEO research tool for the next 24 hours. The block is temporary and your access will be restored within the next 24 hours.
I hope that helps :)