What I am interested in:
Serving small static content (JS/CSS/fonts/small images/etc). All easily cacheable, no streaming. Basically things that people often put on CDNs. Upload support is not required.
Recording some basic statistics (at least access counts per Referer and last access time per Referer), and being able to see them in a Web UI.
Potentially blocking hotlinking (some rules around who can request content), but this is optional.
That has to run on Windows Server + IIS.