Very geometrical, seems to take a lot of inspiration from Bungie M1 maps (I was reminded of What Goes Up, and Bob-B-Q, for example). Great flow, and the single 1x recharger provides just enough temptation to get your buddies blown away.
Crashes 040's hard, but it's pretty playable on powermacs. Much nicer than its M1 counterpart, IMHO. Update cleans some stuff up. Latest version actually lets you out of the death trap.
An open arena with a tower in the center, and a spiral path around the outside to reach it. This version fixes the zero length line bug the original had.
A very large, very pretty, very nastily-designed water level. All ammo is on dry land. Almost all dry land has shallows next to it, making it very hard to get up... but that doesn't stop the Flick'ta underwater from whaling on you...
When I first tried this, I hated it. After about 3 minutes, though... this is a pretty decent map. Well laid out in terms of ammo/weapons vs. open space... there's no free lunch here. You want stuff, you got to take chances.
An update to Pit of Despair. 2 maps. Pit of Despair has been improved to actually live up to its name. The second map, Stranded, is a variation on the same map, but with an entirely different feel... a central tower (perfect for King of the Hill) can be isolated via switches from the outer ring. Looks like this one would be great for teams.
The first release of the Marathon Mapmakers Guild, Devil contains 20 levels, along with cool original art, an entirely new storyline, and some nice twists.
5 maps, again... all great maps (some of the best of the M1s), but again, the textures will hurt your eyes. (They're still fun, though...we hit 12 dpm again on a 2 player game on Cylinder...)