just really trivial, coz it still works fine even with the slight quirk...

from skins/atom/_main.php
Change:

<link rel="self" type="text/html" href="<?php $Blog->disp( 'atom_url', 'xmlattr' ) ?>" />

to:

<link rel="self" type="application/atom+xml" href="<?php $Blog->disp( 'atom_url', 'xmlattr' ) ?>" />

Atom validation page tool shows a 'self' error (ie href is pointing to a 'non-Atom' page).

If changed to "type="application/atom+xml", it detects the page as an Atom feed, and clears the feed of errors.

Sample: [url=http://feedvalidator.org/check.cgi?url=http%3A//gameshogun.ws/allblogs%3Ftempskin%3D_atom]my feed[/url]

(not sure if this goes here or on the skins/templates sub-forums)