Quote Originally Posted by Lobodeb
Affect and effect. What is the proper way to use this? "How will this affect me?"
From http://www.askoxford.com

To affect something is to change or influence it, To effect something is a rather formal way of saying `to make it happen'. Confusingly, either may produce an 'effect' or result. ('An affect' is a technical term in psychology.)

Correct usage:
The stability of the wall was affected by passing lorries.
The demolition of the wall was effected by the detonation of a charge of dynamite.
The dynamite did not just 'affect' (influence) the demolition of the wall: it caused it.