A comparison between WebSphere and .Net ?? Are you kidding ???
Seriously, you will certainly find numerous comparisons on the internet using Google. But most of the time, it is not really interesting as it's only commercial stuff. The best application server on earth is the one which fit your needs, that's it (now you've got to define your needs and constraints)
There's on link I'm aware of listing each Application Server's features. But it is not up to date. For insstance, WebSphere is now J2EE 1.4 compliant with the release 6 But anyway..... here it is...
/ JeanLouis<br /><i>"software development has been, is, and will remain fundamentally hard" (Grady Booch)</i><br /> <br />Take a look at <a href="http://www.epfwiki.net/wikis/openup/" target="_blank" rel="nofollow">Agile OpenUP</a> in the Eclipse community