Howdy, all.
I've been playing DF for a while now, and as I go along, all sorts of minor nagging questions keep popping up. So I thought I'd start a thread for general questions concerning game play. Fellow beginners are welcome to pop in with their own questions, and answers/advice from experienced players will be gratefully accepted!

I'll just start off with a few of my own questions:
1) Whenever I open the U menu, the names of some of my dwarves are blinking. What does the blinking indicate?
2) Once my Bookeeper has achieved the highest possible accuracy level, is there any reason for me to keep him busy updating stock records? (My Z screen appears to remain accurate even when I set him/her to the lowest level of accuracy.)
3) What are some important considerations with regard to fortress defense?
(I'm in the middle of my second season, and I've had some goblin ambushers show up. I had built a system with two drawbridges in a 5-tile corridor, one right behind the other. I thought I'd draw up the inner bridge, wait for my opponents to storm in, draw up the outer bridge, and then -- WHAM! -- lower the inner bridge on the poor trapped bastards. Instant goblin mush, I thought: so tasty, and so good for ya! But the goblins didn't come near my bridges. They just mulled around outside until both were lowered, after which they came running into my hallway in order to die grisly deaths in the teeth of my stone-fall traps. So: do I need to figure out some way to lure my opponents into my evil lair, and if so, how?)
4) I'm not exactly the most technically gifted geek on the planet, and I can't make heads or tails of the wiki's explanation for how to build a mill powered by a windmill. I have a room allocated to milling, one level below the surface. Can someone explain to me, step for step, exactly what I need to do in order to get it up and running? Do I:
A) Dig channel on surface
B) place millstone under channel
C) place windmill on millstone
or, if I build the windmill on the surface, do I need a gearbox to connect it to the millstone, and if so, how does that work?
5) Moats? Moats! We don need no stinkin moats!Back to defenses again: I've had start over several times because I make a total hash of my defenses. I recently flooded my entire fortress by mistake trying to build a moat. I dug channels from a river across my underground hallway entrance, attached a flood gate to a river, and opened 'er up. Why didn't the water flow into the channel?
6) I have a stockpile specialized to accept only articles of clothing that my dwarves keep dropping around the fortress when they wrestle and such. I've set it up under armor, and blocked also specific pieces of armor -- plate, chain, etc. Both u and j are toggled as well. My fortress is rapidly filling up with stray pieces of clothing and I'd like to clean up. I can't see what I'm doing wrong. Am I missing something?