Having recently tried a game in an area without forests (not even shrubs) of any sort, I've come across three things that I find, at the least, interesting.
1. Levers: Levers, as has been said previously, trigger all connected mechanisms at the same time. However, it is impossible to alternate mechanism activation with a lever. For example, I hooked up two doors to the lever and pulled it, opening the doors. I then hooked up the floodgate, and pulled the lever. Because the doors are already "activated", they deactivate first and the floodgate won't trip until the second pulling. The second pulling, of course, opens both doors and the floodgate...
2. Stoclpiles can be assigned to take from other stockpiles. Indeed, the manual suggests using this function to, for example, divide a mining stockpile into ore, gems and stone, which can be kept closer to your industry. Unfortunately, while it is possible for one stockpileto take from many, it is impossible for many stockpiles to take from one. As an example, a mining stockpile can be set to take from stone, gem and ore stockpiles and will do so, combining all the material in one storage area. However, the reverse is impossible; assigning the stone to take from mining will cancel the gem or ore, and vica-versa.
3. No wood maps are exceptionally difficult, which is fine. Provided they are happy in other areas, your dwarves can survive without beds for long enough to grow and harvest Tower Caps. However, knowing that you have no wood, one would assume that's what the merchants would want to bring... at hugely inflated cost, of course. .
[ August 28, 2006: Message edited by: Sophismata ]