Can I use a PC/Mac keyboard as a Bluetooth keyboard for iPhone? I'm wondering about the feasibility of using my iMac's built-in bluetooth as a source for keyboard input to my iphone. 

There are times I want to type longer messages in my iphone, i keep a bluetooth keyboard around just to have a full sized keyboard to use on the iphone. I don't use the keyboard on my iMac because I have an ergonomic keyboard there that I much prefer. What I think would be great is to use that corded ergonomic keyboard as an input to the iphone via a bluetooth device that uses the iMac.

Any thoughts on this?
There are apps in App Store: iKeyboard ($9.99), Type2Phone ($9.99), 1Keyboard ($9.99) and Typeeto ($4.99) that allow to use your Mac's keyboard as Bluetooth keyboard. The obvious requirements are Mac with Bluetooth and recent OS X.