another one that would be helpful: have the RSS feed include a link to both the article linked and the comment thread. right now, it seems to only have a link to the article...
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