This weekend I wrote omekaR, an API client for Omeka in R. (Yes, I had earlier written an Omeka API client in Ruby. But since the main reason that I would want to access an Omeka site is to do some kind of data analysis, R is a much more suitable language.) The client is very bare bones at the moment, but it can get any kind of resource, fetch all items, and extract metadata from items in a way that is idiomatic to R. I will likely finish the client when I write the section on APIs for Digital History Methods in R.
I've recently migrated this blog, and the older posts might not yet be satisfactorily cleaned up. Apologies for the temporary mess.