A Web of Rules (XML.com) by Kendall Grant Clark reporting on the Semantic Web rules sessions, technologies at International Semantic Web Conference (ISWC) in Florida this week.
Kendall points out "LAMP" hackers not taking RDF to heart as of yet. This might be the case since they tend to use tech only when they need it.. I have noticed that in the last few weeks, the perl CPAN people have been working on their RDF mechanisms for packages - RDF was on the list of solutions for a descriptive web problem that they wanted to solve.
Anyway, most of the article is about rules for the semantic web. Not my area; personally I think we need a LOT more data first. I have heard that RuleML is probably the worst XML syntax ever.