After reading some old threads about people using the Razer Nostromo as a left hand drafting keypad, I decided to try it out.
After a month of tinkering and learning I can honestly say that I would hate to be without it now.
I'll post up my keymaps (as of today, it's a work in progress) in case anyone's interested. I have the keymaps colour coded according to the lights on the Nostromo, and I hold either the thumb button or the (thumb) d-pad to move between keymaps. When I let go with the thumb it returns to the default map.
If there's any interest out there I'm happy to expand this thread, answer questions, or explain some of the better macros I have like 'Super Save' which does everything you could want in one button.