Well, it looks like most but not all prefer the aggregated RSS feed.  So here's what I've done.  The aggregated feed, with one item for all posts in a day, is once again the default (rss.xml).  This is what people will use if they don't know or care, and/or if they use RSS autodiscovery, and/or read feeds in a browser like Firefox or Safari.  The splintered feed, with separate items for each post, is still available for those of you who prefer it (rss2.xml).

So how do people find out about the splintered feed?  Well, at the bottom of each aggregated post in the default feed, I've added the following blurb:

[ You are reading the "aggregated" RSS feed for Critical Section, with one item for all posts in a day.
If you would prefer the "splintered" RSS feed, with separate items for each post, please use this link instead. ]

Seems like a decent solution, doesn't it?  Okay, back to the real world.