The Earth stops spinning

[evenflow]

What would happen if the Earth stopped spinning:

A) Really slowly, over a period of years
B) Suddenly, within a second (I'm imagining tsunamis, earthquakes and general mayhem)

[evenflow]

LimaDelta said:

b) 1000mph winds scarify the face of the earth killing everyone and everything more or less instantly. Huge tidal surges. Safer at the poles, or on the ISS, but survivors will get lonely, fast.

These are the kind of details I'm after. How big would the tidal waves be? Would the crust crack and generate previously unseen levels of volcanic and earthquake activity?