I like Adam’s idea of the two sessions–I think that would be very helpful and interesting to many levels of experience.

Here’s a quick list of the tools I’ve been using:

• RAP (RDF API for PHP)
• ARC (a lighterweight PHP API)
• SIMILE was mentioned below, I’ve spent the most time with PiggyBank, Exhibit, and Solvent
  
• IsaViz graph editor
• Protege ontology editor
• Twinkle quick SPARQL querier
• Tabulator FF extension for browsing Linked Data (see also the Semantic Radar from the SIOC project)
• Speaking of SIOC, there’s also their PHP API

I’ve tinkered a bit with the Geonames and DBpedia services, but haven’t really integrated them into anything yet.

I’d love to talk with anyone who’s set up a Virtuoso server for their RDF work. Anyone tried this out?

I’ll follow up on the post about the F/OSS DH Infrastructure to say that I’ll be very interested to hear about projects using RDF, and to talk about a couple of my projects using it.  One project is scraping the Atom feed out of our WPMU installation to RDFize it all and make it accessible in a variety of ways; another is an ontology for describing universities from the viewpoint of the actual teaching and studying (i.e., not just saying such-and-such a class is taught by Dr. X, but also what texts etc. they study, what tools they use in the course of study, etc.).

I’ll through this out, too–is there any interest/desire for some of the people already using RDF to get together to do a tutorial/workshop/something-or-other for the curious about RDF, SPARQL, ontologies, etc?