Somewhat similar to friendfeed for News.YC. Its going to be slow because I need you guys to warm up the cache for me.
The AJAX features ("more", "replies") are currently disabled but should be working by this time tomorrow, also previous and next pages are in the works. I'm off to YC meetup in Cambridge, enjoy and don't break it.
I actually like the fact you can look at feeds and see deleted and changed posts. With observation and a little comparison, you can see the revision process (or lack of) for (your favourite) users.
Works fine for me, no delays. I'm still impressed with the personal RSS feed. With comments this makes it even better. Well done.
I'm not crawling the entire site, just enough to get the data that is needed. I think the app would still work if my ip was throttled anyways, albeit new items would show up on feeds later (but the app response time would be quicker).
EDIT: I guess not, but you should add friendfeed support :D