if you have a xml sitemap for google you can use the same one for yahoo. just sign into yahoo site explorer and submit it. I use an xml format and it is really easy to submit.
Read This: http://help.yahoo.com/l/us/yahoo/smallbusiness/promotion/meta/meta-08.html Is very easy /jik
yeah, they support the same format as Google. Does anybody know how long it take for yahoo to start indexing it? I uploaded mine a week ago, it says "processed" in site explorer, but it seems it have not start to crawl it yet.
Just make a text page containing all your links and submit to yahoo. Yahoo anyways doesn't crawl sitemaps as reliably as Google. Submit it through "submit site Feed".
Visit xml-sitemaps(dot)com and just add your url it will create your XML sitemap for google as well as urllist.txt for yahoo.
I'm also not sure about the yahoo site explorer program for crawling the sitemap as Google crawls it periodically.
Yahoo sitemap supported formats are pretty much the same as for Google. You may want to read this sitemaps article that compares / shows examples of all sitemap file kinds.