I am not sure whats going on but my site http:www.logisticforums.com has 3200 indexed pages in google a week ago and has been dropping down around 200 per day and is now under 2000. I have no idea why and look for advice on why.
Any clue what types of links are vanishing? Maybe with googles webmaster tools, or yahoo's site explorer? Figuring that out would likely be the only way anyone could give something other then a guess. Singnature links would have the same effect...