I was reading a post over at problogger about knowing when your site has been ‘dug’ and thought I would point out google alerts.
I found out about google alerts from reading garythescubaguys excellent seo whitepaper, but have since used them for a fair few things. The premise is that you enter a phrase, select ‘as it happens’ (as to how often you want to be notified) and then every time the phrase is found by google it will email you details. Now obviously entering ‘car’ would result in an email every second - so when you choose phrases do so well.
I use it to watch for my web address (so I have 1 alert for criTix.co.uk), for my name (so I can find out if anyone is cussing me online…lol) and company name etc. It might take a little experimenting but its definately a useful tool!