Yeah I know there a lot of these but three of my sites dissapered off google for keywords that I was really high on!
must be some kind of update I guess, I'm used to it happening on one site but not 3 and on all 3 search engines. Really surprised by one of the sites too as its got shed loads of original content, loads of one way links and is updated daily
Just check if the content has been duplicated and re-used by someone. If so, then u may get lower rankings. Also what r the websites?
i'll join you club superpump...it also happened to me although some gone back to its position still some are missing...don't know what's goin' on with Google...maybe an update??