Slashdot! Especially on iPhone/iPads. It randomly switches between normal and some large font special rendering for no apparent reason. The comments interface is barely usable on these devices too - no drag/drop of the comments filtering threshold, expanding a hidden comment on the ipad scrolls you off a mile down the page, fortunately with a small arrow showing the chosen comment when you scroll back up to find it....

And the ajax interface is so intertwined with the generated HTML I can't see an easy way to write a decent native app...

And trying to google for anyone else's thoughts on the matter just leads to more slashdot stories...

I'm so happy to have found HN for a sane browsing experience! (Not just the usability!)