dnalounge is a feed of the What's New journal; there's another feed for the calendar overview, which is useful for Slashboxes. I don't think that kind of "calendar" feed really integrates with LiveJournal very well, though.
I remember when RSS was about to completely change the world: the web was going to work completely differently by the end of 1998 at the latest. It's nice to see that something useful is finally coming of it. The handful of sites out there like userland.com have all just seemed profoundly useless to me, but being able to dump sites I want to read daily into my LJ friends list is very cool. (Oh good lord, here's marca sucking guha's cock and comparing him to Gutenberg: TechVision Innovators! Shooooot meeeeee...)
One irritating thing about how it works today is that most sites seem to only provide titles in their feeds: for example, the slashdot feed only has the titles and URLs of the posts, not the front-page paragraph and its links; and memepool is even worse: that feed converts their news items to plain-text (all the links are gone) and truncates them to 90 characters or so.
Hopefully these feeds will improve now that the 800lb gorilla we know as LiveJournal is shuffling toward them...