ember - 6:09 pm on Nov 30, 2010 (gmt 0)
Diversify, diversify, diversify. I've been doing this website/search engine thing since 1999 - remember Alta Vista? - and have been through every up and down there is. Search engines are your friend - until they are not. Don't think it can happen to you? Just wait. Never depend on one source of revenue, especially a fickle search engine.