Greg Patillo has some excellent youtube videos of him beatboxing and playing flute.
Super Mario Brothers!
Excellent stuff. He has a Myspace page (I hate myspace). Check him out!
If you want to learn more about beatboxing, check out Humanbeatbox. They have some videos and tutorials there. I found the site very enjoyable, especially some of the demos. The guy has this English/Australian accent that just cracks me up. (L as in Lollipop).
But seriously, beatboxing and flute is a very cool thing. Coolest thing I’ve heard since Tom Scott’s flute solo on Patrick Williams tune Threshold.