Error: I'm afraid this is the first I've heard of a "trackback" flavoured Blosxom. Try dropping the "/+trackback" bit from the end of the URL.

Good articles from Perl.com

Massive Data Aggregation with Perl by Fred Moyer: Shows how to do a mod-perl based upload and give the user constant feedback via Javascript
More Advancements in Perl Programming: has a great piece on Yahoo’s public API for getting keywords from a document.