Static discharge?

[jamieboo]

I'll finally be commencing my first ever build in the next couple of days, and I'm just wondering how many of you seasoned pros use those anti-static wriststraps? Are they recommended, or is the odd tap of hand to case really all you need?
Thanks

 

[jamieboo]

Ok, thanks.
Just let me be clear about the specifics of the case touching tomfoolery. The PSU should be plugged in, but not turned on right? What about the mains wall-socket its plugged into, does that need to be on or off?
Ta