The best way store thousands of Images on a server
soult: I recommend gatling: http://www.fefe.de/gatling/
It's the fastest httpd I know of.You might also want to try thttpd: http://www.acme.com/software/thttpd/
I heard all the porn sites use it to host their images.With only the http server for the images running it should work quite well to rely on the filesystem cache.