Triple Soup "Apache TripleSoup is an effort started within the Apache Incubator to create a SPARQL endpoint that is easy to set up, fast maintainable, and such and so forth. We're only just getting started..."
The Triple Soup Wiki has more information: "TripleSoup is the simplest thing that you can do to turn your apache web server into a SPARQL endpoint. TripleSoup will be an RDF  store , tooling to work with that database, and a REST  web interface to talk to that database using SPARQL , implemented as an apache webserver module."
It's to be implemented in C and the authors of Redland (Dave Beckett) and B or lib B, a storage backend for RDF developed at Joost (Andrea Marchesini) are involved. Via Simon.
Also mentioned, "SPARQL Via HTTP Methods".