Hey folks: we've put together a sample of using the Avatar SDK with a few scripts to add object grab/throw functionality. I've attached it here. It requires the Oculus Utilities for Unity, and the Avatar SDK.
This isn't the end of our hand samples, but I didn't want to leave you without at least a basic grab sample for too long.
Known issue: it works in 5.5.0f3, but crashes in all 5.4.x versions of Unity I've tested so far. For now it's a 5.5-only sample. It doesn't rely on any 5.5-only functionality, however, so you should be able to use the scripts in 5.4 without a problem.
EDIT: updated to behave well with locomotion such as OVRPlayerController, 1/3/2017.