Hello,
The update does not work with Yahoo.
<Error xmlns="urn:yahoo:api">
The following errors were detected:
<Message>
The service has been shut down. For further details, please see the Deprecated Services blog post http://developer.yahoo.com/blogs/ydn/posts/2010/08/api_updates_and_changes
</Message>
</Error>
(I use Version 4.0beta7)
http://wordpress.org/extend/plugins/google-sitemap-generator/