Google Alerts: watch the web growing

Google has very cool service, which is now that widely used as mail, or docs...
It is Google alerts. Basically, idea is very simple - you just get to their website and enter keywords you want to get notified about.

Once Google bot indexes page, which may be relevant to the search query you've provided - you get an e-mail message about that. Some kind of 'Google bot news' :)

You can tune the service to send you updates on each encounter of relevant page, or pack these pages to daily/weekly digest.

This things becomes very useful, when you watch some activity on the web - for example, your partner's website.

Google Alerts is an example of minimalistic interfaces (as for me), and that's why it has this tag granted :).