Here's my two cents. I've never paid the $299 Yahoo inclusion fee and have been listed on the first page on yahoo for a number of our top keywords simply because I'm a paying advertiser for Overture and I've been ranked well with Google and a couple of other SE's.

Why pay an extra $299 to have your site listed in Yahoo - who knows where, with who knows what description? especially if you can use Overture and write your descriptions and titles the way you want(w/i guidelines of course!), AND send your visitor to the exact page you want them to land on? Use that $299 for better advertising elsewhere...

Cheers - Jill