This module creates a callback for generating a list of URLs to be submitted to search engines like Yahoo's Submit Your Site at /q=urllist or /urllist with clean URLs. Google has a separate gsitemap module from the Google Summer of Code 2005. Right now urllist only has a basic support to list every published node and log accesses (if the administrator turns logging on).
As soon as I submitted a urllist to Yahoo, I got a hit to load it with a User Agent of "Mozilla/4.05 [en]" from 216.155.200.103. The IP is owned by Yahoo, so I thought it would be interesting to point out the initial hit doesn't appear to come from a User Agent with "Yahoo" in the name.
Potential future features are gz output, turning off certain node types in the list, and the option to override specific nodes being listed. For now, if you use this module, and want to override a specific node, you'd have to use robots.txt to make an exclusion.
Find the urllist module home on drupal.org.