Hi there,
as far as i know, about 90 % of the nntp-server out there are running inn.
I never tested it. Leafnode will do.
For running your own news-server, you will need
1. static ip
2. permanent connection
3. lots of bandwidth (think of the alt.binaries hirarchy
4. quite a big server (about 200 GB diskspace for news only, lots of RAM).
At least this is, what the people at the FU-Berlin do with their cis.dfn servers.
You will never try this on a Pentium Machine running at a 20 GB hard-disk right?
News-server are dedicated machines.
hth
Alex