The Objective-C DRMAA implementation has now been wrapped in C as per the 1.0 DRMAA C binding spec. Far more code than expected, but all very straightforward code.
All that’s left is some real testing of the C layer, filling in a couple holes in the Objective-C code (most notably supporting file transfer via scp from other hosts), and doing the Java bindings, which will consist essentially of code lifted from the Sun Open Source Grid Engine code base.