Yes, I have a site that was badly hit. It went from the top page of Google to the 115th page.
But it was nothing to do with table tags. The problem was the colour scheme, which was essentiallly just black and white, with the links in blue. But now I've changed the background to mint green, with the main text in dark brown, and the headlines in gold. That seems to have been successful, because the site is now back on the first page.
Mint green is definitely the way to go.
This all happened since Tuesday of this week.