Some CTF maps for a game off the beaten track:
CTF-UrbanReality: If you can stomach a large (7mb) d/l, you'll find that this map is pretty darn good. Red phone boxes, Underground (subway) stations and bases which double up as nightclubs. The design also kicks butt with lots of fraggin' in the streets and people's backyards.
CTF-Battlezone: Oh man, lots of strategy in this one. It's two bases with a WIDE open space in between, with a few walls and trenches scattered around. With a large amount of players (no less than 16) it can be really good with teams having to split into offence and defence and send out carefully planned attack waves.
CTF-Siberia][: This one takes place in a big Siberian base. There's plenty of places to show off your rocket and sniping skills, and the map is well designed too. I'd advise that you learn this map offline though as if you play it 'blind' online then you're gonna get lost.
CTF-Atari2600: Hehehehe you haven't PLAYED CTF until you've seen this one. It's basically a maze with two bases and steps either side. The nice thing about this map is that although the normal version is fine, playing it low-grav really turns everything on it's head. Flashback to the 80's! /~unreal/ubb/html/smile.gif
Smooth like a rolo, cool like a polo. We commin' out wid da bad bwoy flow! Inside!