Cool. I think some of the older places I use (that still use bbcode instead of markdown) break if you don't have a file type in the actual url (I can't check any time soon), but not hijacking the direct link is a good step.
I'd be interested in checking it out. Other things that would affect me actually using it full time would be the presence/quality of any tools to organize a library and what your pricing model eventually looks like. I've been flirting with self hosting my stuff but it's just one of many projects I want to do and I never seem to have the time.