Which Triplestore for rapid semantic web development?

Question

Ease of installation/use is the most important factor here - not performance.

Small is OK as large datasets are not expected.

Answer 1

Old question, but just as an update:

I have tried Virtuoso, OpenRDF Sesame, and 4store (all in their June 2012 versions) and found 4store the nicest to work with, as loading data, starting and stopping the server, etc., is quite simple.