I know this topic is a bit old, but I just wanted to lend some encouragement here...
While lots of people have moved on to Red Alert 2, Renegade, and Generals *blehk*, Tiberian Sun is still widely played. It's a shame it isn't played more, but I think with a little encouragement the community might be re-installing their games soon... as I'm right now trying desperately to make the perfect Tiberian Sun mod.
Anyhow, I'm still making maps, and still loving it. I have a lot of maps I've made but never released... if you want em just IM me on MSN...
Here's a couple places where you can find tons of TS maps:
http://www.tiberiumsun.com/downloads/maps3.shtml (note: download canopy, it's a really good map that I made)
http://www.tibmw.com/page.php?load=g...downloads/maps
And you can also find a lot of nice mods for TS (including my old mod, though it's terribly unbalanced, it's really fun: Earth's Final Hour) here:
http://www.tibmw.com/page.php?load=g...downloads/mods
Enjoy! And keep making TS maps!