I had a website ranking #6 for it's main keyword. It wasn't moving at all for a couple of weeks and Yahoo Site Explorer was finding a few more of my backlinks each day. Suddenly one day it found 400 backlinks, then 200 the next which made me jump from 400 backlinks to just over 1,000. At the same my site dropped from #6 into the 50's. I can't for the life of me get it to recover. I've gotten it to the very top of page 4 but it always falls back onto the 5th page. I've checked over my on-page seo, tried different WP themes, tried not building new links, tried building new links, but I just can't seem to recover. Fresh content is added daily but Google just de-indexed about 60 of my pages (none of my vital pages though). I guess I just don't get what I did wrong besides getting a bunch of backlinks in just a day or two (although it wasn't on purpose).