High pitch whine!

[hijinks]

I'm having a high pitched whine coming from under the hood when i hit the gas. It seems to only happen when i hit the gas though. If i brake or let off the gas going around the turn I don't hear anything. If anyone has any ideas on what could be wrong let me know.. i'd like to see if i can do it myself before going into the shop to pay $60 for them to tell me whats wrong.

Thanks
Mike