Way back in July, there was a fairly big thread ensued on use.perl about people leaving, and keeping track of their journals. In the wake of that I knocked up a bit of code that visits a site, reads the RDF feed, and generates a listing a lot like the use.perl friends page. (Note that RSS 0.91 feeds are a bit useless, as they don't have time metadata. More on that later.)
I've been prompted to revisit it because London.pm is looking at how (and whether) to revamp the site, and it struck acme that maybe collating people's use.perl.org journals would be a good idea. It turns out that plugging the RSS feed of this journal into the CGI works fine, except it doesn't have a timestamp on the entry. (Pudge? Please?
In a similar vein, I've seen an interesting collection of blogs on haddock.org, which instead of presenting snapshots of entries like my code does, provides a chronology of updates. This is also pretty nifty.