Read the book "Screen writing from the Soul". If you have time and like to read, this book will motivate you like you got a fire under your ass.
If you don't have time to read, then listen to music as the others suggested. Listen to "School" by Supertramp, listen to "Optimistic" by Radiohead, listen to "Loose Yourself" if you can stand Eminem, I like it, go listen to some of the new Silverchair album, or go and watch "American History X" or "Do the Right Thing"...then go to the beach if one is near and listen to the ocean!!! These things should help.
Lets hope this thing ends quick...enough said