Master Server Game Browsers (eg. Internet Doom Explorer) seems to be big things these days. As long as the source-port can run dedicated servers (low CPU/memory consumption, fast, reliable, stable) then people will like to host and run it 24/7 forever! Which means, more people seeing that source-port and using it and keeping with it as it updates, etc.
Currently IDE happily supports all ZDoom children (csDoom (used to), ZDaemon, Skulltag & Odamex). Would be cool to see IDE work with Vavoom, etc.