I came across this one in a book by the Frugal Zealot. Put a lid on your pot of water and turn your stove on. When the water is boiling, put your noodles* in a stir a bit so they won't stick together. Bring water back to boiling put lid back on and turn off the stove. Let the noodles sit with lid on for about 8 to 10 min or until al dente. It works like a charm and saves 8 minutes of energy time!
*Does not work well with spaghetti noodles.
**A trick to keep your noodles from sticking after is to add a bit of Olive Oil to the water BEFORE you put your noodles in. This will coat the noodles slightly and prevent them from sticking together.