4 switches

I live in a home built in 1931. Most of the wiring is original knob and tube, except for the kitchen and bathroom which were upgraded in the 80's and have more modern plastic-clad wiring. The kitchen and bathroom outlets are all 3 prong, but only one or two outlets are grounded, the others aren't (the ground wire is either missing entirely or it's there but seems to not be connected). The bedrooms outlets are all 2 prong. I would like to replace all the outlets in the kitchen and bathroom with GFCI outlets, even if the missing ground makes them somewhat less useful. I also seem to recall reading somewhere that having GFCI in the bedrooms is a good idea, to help with sparking or something. Any thoughts on this? Is this in keeping with current electrical codes, even if the ground seems to be missing or non-functional throughout most of the kitchen/bathroom? Thanks, Razvan.

I just bought a house. It has 100 amp service, with a 220 dryer wired in with a 30 amp, double pole circuit breaker. Is this done correctly? Is there a better, more efficient way of doing this? Dang meter looks like it's gonna fly away!