Tool to check if my sites appear for specific KWs at any time?

Hi all, I am wondering if such a tool exists... My problem is that Google are watching my niche and I am pretty sure I know what KWs they are searching for to find my KWs. So I've removed all pages they could possibly land on, but I have to keep checking it every day to make sure other pages from my site don't re-appear for the search terms...! Is there a way that anyone knows to automate this?

Basically something like a way of checking if any pages from my site are appearing for "keyword1" and then get an email alert if they do?

You won't get an email alert but serpbook checks every half hour and will generate an alert in the user interface.

serpwoo works