Yahoo! has a new search tool for webmasters. Site Explorer lists out any site’s pages according to their popularity in the Yahoo! database. This is a good way to see how your site’s individual pages rank on Yahoo!.
For sitemaps Yahoo! accepts a plain text file at the root of your domain name. Each line should include only one url and you can name the file: urllist.txt or urllist.txt.gz (if you are using gzip compression).