When you mouse-over a link in a story, its URL is displayed in the browser status bar. This is no longer true for links in comments, which shows the domain as a hint next to the link.
It would be preferable if it worked the same as stories, as I like to view full addresses before clicking.
My Slashdot viewing preferences are nested, oldest first.
My browser is Maxthon, which I believe uses the IE6 engine.