Shibam looks nice. Judging from the screenshots it apparently seems larger than it is - I would've expected more than 2-4 players.
Iron Yard is probably a keeper, too, considering it's a sst13 map..
shibam and iron hive are both awesome in their own ways.
shibam has an open air feel to it. you have easy access to the rooftops and the entire map is basically one giant area. lots of detail, some edges are even beveled!
iron hive is less detailed, but cooler looking. the skybox is really wild and i'm a big fan of dark metal with green lighting highlights. :)
Iron Hive Is Great
downloaded shibam to check out later.
Family Fun Factory And Shibam
Those are great maps. I like esp first one. Have to check Iron Hive.