I assume you mean keyword meta tag. I've never stopped doing them. But aside from the meta tags explain to me how you would optimize for the other SEs differently than you do for Google?
All the sites I have optimized recently have had an optimized keywords tag (no not one of those 200 word dictionaries you so often find but two or three relevant phrases) in place. It takes less than a minute per page to do, and when/if Inktomi results start to show up on Yahoo, I will be just a bit ahead of the game.
The fact is I optimize for Google and Google alone and then I add the keyword meta tag. Whatelse should I do to be ready for the major shift in SE popularity you are all so certain of?