Hey 404, congrats on getting an interview and good luck! I'm on the post-doc trail too. I got in contact last week with the guy I want to work with - he really is the only person doing stuff in my area and using the same theories - and got a 'hmm, maybe, get in touch again in September'. This wasnt even asking for money, it was a 'if I get funding can I come and work with you'. Now i am in limbo, I guess I should start on some plan Bs, but i am really hoping this guy will say yes eventually.
So yes, I'd say you've done well to get an interview!