BainScape is a 317 server that I've been running for more than three years straight now (I began hosting around June 2009). It was by no means a good server from the beginning, but I've dedicated large amounts of time to fixing and updating it throughout.
It was once, I'd say, a somewhat popular server - peaking at around 200 players at its best. But that was a long time ago - time has progressed, and the online presence of my little server continually diminished. I guess I haven't done a very good job with advertising