hi! I developed a tool similar too the keyword tracker . (only simpler a view months ago (also php)) The tool worked now for about two months (automatically made about 800 queries per day), but till last thursday the google api throws many internal server errors. so its not possible to fetch all my about 800 queries. Do you also experience such internal errors of the api in your tool?
It might be that they're doing some maintenance to the API servers. I've been getting errors with my search tool (see sig) everyday for the last 4-5 days and according to my logs I'm not even close to 1000 queries. This happens ocassionaly. ED