In my graphic design classes I was taught the OFPISA problem-solving approach.
1. Objective - what is it?
2. Facts - get them
3. Problem - restate the problem (targeted)
4. Ideas - anything and everything
5. Solution - pick the best of the best
6. Accept - now you have to put this thing into practice
This is only one of a number of methods that have acronyms for easy remembering. Most are quite similar.
I use this sometimes, but I find that by actually writing out (paper and pencil) I can actually stimulate my brain into action. I make drawings too, so my computer is actually a hinderance.
Also, this Warrior Forum is really great for idea stimulation. There are some amazing minds in here! So, back to the question - How do you stimulate your creativity?