I wanted to report a bug to TRAC but thought to first post it here.
It seems that in WP2.7 the comment_text function creates two(!) a-tags to create a link. So when comment with the an url, ie http://www.youtube.com will be showed/processed as [a href="http://www.youtube.com"][/a][a href="http://www.youtube.com"]www.youtube.com[/a]
It's not a real error (everything works fine) but it's a waste of extra html code;)
Can anyone confirm this behaviour? (wordpress 2.7)