Think its time we go old school, launching more hl1 mod based servers. With so many fk'n mods to choose from, there's a flavor for everyone to njoy.
I suggest to launch a server for these mods: Scientist hunt, Buzzy bots, XDM and They hunger.
What about the russian half life mod that was 2D?
we definiately need to give science & industry a try along with the specalists, heard they still have players who gather every now and then to match
Edit: Due to recent activity on the wastes mod, might be worth giving it a try as well.
http://www.moddb.com/mods/the-wastes