thanks to everyone who's sent feedback about any problems or gaps they're finding with the site. I'm still trying to get to the root of the comments and search error messages, but one thing I'm finding: if you submit a comment and get a server error message, don't worry too much--the comment is almost surely in the system and will show up fine.
Until I can iron out a publishing issue or two, though, I'm taking the category-specific feeds offline for a bit. I'm never sure how many people use them anyway, but if you're one of those guys who likes his stroller news in the main vein, pure and undiluted, hold on, man, I got a shipment coming, I swear.
update: they're back now.