Key Xing Rocks!!
I like function keys and they like me!!
QuicKeys is too bloated and WAY too expensive. Through the Apple Consultants Network, I heard about Key Xing. If you are constantly flipping between applications and miss the ability to program your function keys is OS X, then download Key Xing today. The shareware fee is $7, but I never once received a registration notice nor did I see a limitation in the software. John Scalo, the head honcho at Luma Code, makers of Key Xing, has really come out with a slick application. Do yourself a favor, spend $7 and register a copy. It will be the best $7 you'll have spent today.
Key Xing Favorite: Shift+F1 = Pop-up Google Search. SWEET!!