I don't think I have these sitemap url's published anywhere publicly accessible for search engines to crawl and discover (I've just been submitting them to Yahoo and Google directly) so I thought I'd put them in a post --
Although Yahoo and Google know about them, it is the smaller search engines I haven't submitted to that might find them now..
By the way, I did find this advice for trying to submit a sitemap to MSN, instead submit to MoreOver.com and it will show up in MSN's index.
You do this with a ping like below where you change the url at the end to your sitemap url..
For the Ask search engine the "ping" statement is like --
Note that many search engines now look for a line like this in your robots.txt file so this is also good practice --