I cannot believe it--I just got a message from Yahoo that they will be listing my new site in 2-4 days--in under 2 weeks and with just one submission!
The advice I've gotten from this site has been invaluable. And here's another tip: In the "comments" section I named some of the sites that are already linking to my site, many of which are also listed on Yahoo. I believe this may have tipped the balance--after all, if sites that Yahoo previously approved think your site is worth linking to, then that really says something about the quality of your site.