1. How many players in your group?
I actually play in two different groups. The first group which meets once a month consists of 12 players. Very, very rarely are they all present at the same time. The second group which meets weekly (though I can only play with them in person several times per year) consists of about 8 people.
2. Do you DM?
Yes, at times for both groups, but I am not the primary DM for either group.
3. Do other people in the group DM, and how many?
In the first group, there are three of us who DM. Our principle DM runs mostly fantasy, another guy does supers, and I do horror (this is a very loose generality). In the second group, three of us DM. Our principle DM does pretty much everything, I sometimes do fantasy or horror, and one woman does exclusively Top Secret SI.
4. What's the male/female composition of the group?
The group of 12 has two female players who have excellent attendance. My wife, the third female, shows up regularly, but actually played only for the first time last night (a Dread game that I ran). The group of 8 has three females who all also attend regularly.
5. Got a good gamestore near you and what is it?
I live in Somerset, KY. Several stores stock games without being true game stores. Collector's Comics sells primarily comics (duh), but has the best selection of games in the town, though by no means a great selection. Game King specializes mostly in used video games, but also sells WOTC books and minis. The local chain bookstore (can't recall the name) has a limited selection of mainstream gaming stuff (mostly WOTC and White Wolf).
The group that I meet with monthly plays in Louisville, KY. Louisville Game Shop (or is it Store?) carries a lot of minis (WH40K, Warmachine, Hordes, less so Reaper), boardgames, and pretty mainstream role-playing games. The Great Escape has the best selection of used game items in the city, and probably in the state. Check it out if you are looking for something old. They also carry tons of comics (new and used) and used music, a draw for my largely non-gamer wife. Comic Book World has the best selection of new gaming stuff in the city, carry some of the more obscure lines, though I believe they were hurt by the D20 glut, and still have a lot of stuff that no one seems to want.
I spent five years in Toledo, OH, and the group that I game with via computer (and in person a few times a year) is well served by Mind Games. They too have been hurt by the D20 glut, but will reliably special order everything that I want, sell it to me at a discount, and ship it to me for free. They rock, and I spend 95% of my very large gaming budget there. If you livenaywhere near NW Ohio, check them out.
6. Mainly modules or homebrew stuff?
Almost all of us who run games for both groups homebrew. Notable exceptions include one DM's love affair with the Temple of Elemental Evil, and the time that I ran part of Night Below.
7. How long have you been playing and how old are you?
I'm 33, generally in the middle of the age range for both groups. I have been playing in some form since I was 8.
8. Who taught you to play?
A cousin by marriage who is no longer a cousin thanks to divorce. He got cool and quit playing not long after teaching me.