Ask HN: Is anyone seriously using RDF in a project?

Yep, on quite a few things these days. One thing I would note that may or may not affect uptake is the pretty dire state of good docs/tuts.

I've been working five years on an English dialog system to acquire knowledge and skills via conversation. The minimum viable product has been determined to be a robust parser from English text to RDF. I base my ontology on OpenCyc and the lexicon comes from WordNet and Wiktionary. I use Sesame as my RDF store, and wrote my own ORM from Java objects to RDF triples, modeled after Hibernate.

Each English word translates into about four RDF statements. Currently I'm working on scaling the vocabulary coverage from tiny development size to something that can parse a typical news article.

http://texai.org

Yes, the project I'm working on will have a heavy dose of RDF/OWL/SPARQL/SKOS, etc., but not in "phase one."

Yes. Can't talk about it.