We recently created a wordpress plugin that generates html site maps. The Main Features are: Display the URLs and/or Titles of the pages. The Site Map is generated inside your own wordpress theme. Decide the maximum amount of links to display for each page. Works with with any WordPress version from 2.1 to the latest update. Feel free to test it and use it. You can download it here: Free HTML SiteMap Generator for WordPress
Please give us your feedback, we tested it in several wordpress domains, if you find a bug or a problem let us know.
and that is great! But don't forget that for users and for other spiders apart the ones you can submit XML, HTML site maps, are extremely useful and recommended for better spiderability.