Interesting: Googlert

Googlert is an experimental free service that keeps you updated on what the web is saying about you or your interests. It does this by performing regular Google searches on your behalf and sending you email alerts of any new results that appear.

My first question was how they get around the restrictions on the Google Web APIs, mainly the limit of 1000 queries per day. Duh: Googlert uses your Google license key for your searches.