What to do after getting Google b1tch slapped?

I had an authority site i was developing and it just got slapped hard. It was ranking on the first page for a bunch of keywords and one day, BAM rankings for ALL keywords dropped and now I'm not ranked for most of them and only a few on page 7 or 8.

I'm totally pissed... wtf?

I don't have webmasters installed so I don't know if it was unnatural links or whatever. I mostly used UAW/Onlywire and some profile/bookmarking services to rank.

What can I do to regain my rankings? I'm sad... spent so much time and money on it. DAMN.

How did you use onlywire? For example, did you use the "Switch to Advance Post" or just the regular post?

Regular post, why?

regular post why author ?????

first you need to make that site very useful for users and looking good
second you need to get backlinks from authority sources such as very popular blogs, online newspapers