How-to whistle with fingers (easiest way)!
How to whistle with your fingers
B cool stuff
Image titled Whistle With Your Fingers Step 7 preview
Good Stuff to Know
Image titled Whistle With Your Fingers Step 5 preview
This is a skill I always wanted to learn, and the Art of Manliness has put up a good tutorial. Don't try it after midnight, when your roommates or neighbors are sleeping. it DOES work.
Art of Manliness
How to Whistle with Your Fingers
how to whistle..or not
How to Whistle With Two Fingers | eHow.com