Any luck on this mod_cache like feature for Nginx Brian? I'm in a
VERY similar situation as yours except I am dealing with large files.
(1GB each) What really puts Nginx at the top with it's built in proxy
caching features for me is the option "proxy_cache_min_uses". We have
problems with most cache software because they instantly want to start
caching requests when traffic is turned on but it's not very good when
you have a few hundred requests each serving 1GB files and trying to
write to disk. We use proxy_cache_min_uses to stagger this off.

The problem I'm having is I'd like to get Nginx proxy_cache working
using the document root(network filesystem).

Please keep me updated in your efforts. Thanks.

--cripy