Very few servers ever have maps that are released together with a full-mod. Often, these maps are among the most innovative I have seen. Even the less noteworthy ones still offer damn good gameplay (without attractive gimmicks). I think that it's high time servers stop ignoring these cool maps. One of my favorite mappacks is this one here:
http://www.numgun.has.it/ (click where it says maps)
Disclaimer: do not say anything about Counter Strike maps b/c A: they are all R/S based B: they capitalize off of Counter Strike's popularity.
If you don't believe what I said about mod maps being innovative, download mappack from the link and check out the teleporters and artillery cannons. Please consider including these maps in your servers as well as other undiscovered mod maps.
(I hope I didn't post this in the wrong place...if you think I did, ask an admin to move it)
