Feature Request: Add a star to the threads link if there are replies to your comments?
The star would then be removed when you visited the threads section again.
But the real problem with the feed now (as others have mentioned) is that there's no slash between .com and item.
I.e., http://news.ycombinator.com/item?id=102297 shows up in the feed as http://news.ycombinator.comitem?id=102297