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From what I've read, the Meta Keywords tag is generally worthless these days, and the Meta Description tag is useful only for specifying the description a search engine should use for your page. Does that sound about right?
But do they help with other search engines?
A little over a year ago, there were posters on this forum who said that meta description tags were worthless as far as Google is concerned. When I mentioned that many of my Google search results were using the meta description tags from my pages, some people (I think) changed their minds.
I am by no means the most expert SEO specialist on this forum, although I've done very well.
My attitude is that if it can't hurt, but can possibly help, then do it.