How many tables do you play at once?

I multi-table at least for but if i really feel in the mood i will do 6 tables. I play mainly 6 max so i find that anymore than 6 tables and i feel completely rushed and i tend to force plays which are never good. I also just started using tableninja and wow it helps so much.

4 usually, normally a freeroll,2 tourneys and a cash, i need a bigger screen lol

I play on 2-4 at a time...

But if i really want to concentrate, then ill just play 1.

Depends on what game/type I'm playing. If its FL holdem I can play up to 9 comfortably. And I do tile them. If im playing MTT's I like 2 that I can focus on and a freeroll tucked small in the corner. For matching SNG's 4-6 is my comfort range. If i'm playing NL cash games I like 4. Exactly 4 no more no less. Lately I have been spending most of my cash game time playing razz. There's not usually more than 2 or 3 games going at a time at my level, so I play them all up to 4.