It's a search engine like google but every time you search for something you donate money to charity (it doesn't cost you anything) You choose your own charity and it tells you how much has been raised through the site each time you search for something.
It seems to work ok and it was in the Guardian, so it must be legit
Anyway, thought I'd mention it in case it's not something that you lot all know about and have been using for years without telling me