What's the difference between affect and effect?
This is another question that's been sprung on me recently, and here's what I said:
To affect someone means that you have an impact on them, whereas to effect means to bring about, or to cause something.
The new leader is effecting big changes, which directly affect my work.
The best tip I've heard of if you are unsure is to see if you can put in the verb 'to make' for effect without, er, affecting the meaning.
* That or Which