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Robert_Charlton - 1:10 am on Sep 19, 2002 (gmt 0)
When it disappeared, I checked and found that its ODP listing was gone, apparently due to a reorganization of the ODP category, and I thought this was probably the cause. The site came back, though, to roughly the same position it had held before. No idea why. I've learned to be patient about these glitches, but this one had me scared because the ODP de-listing was an apparent cause. I've no idea whether the Google recalculation of Page Rank in fact had anything to do with the temporary drop.
I had a well established site drop way down in Google last week for about three or four days and then come back.