Rumour has it that Apple is about to push out a new wireless keyboard and multi-touch mouse if filings over on the FCC are accurate and the iphone blog says why not make that wireless keyboard work with the iPhone.
The iPhone now has the missing MMS functionality, but so far no wireless keyboard functionality, but with a beta for iPhone 3.2 Apple could introduce the drivers for said keyboard.
Which to me seems like a reasonable idea, why not have a wireless keyboard that is compatible with the iPhone, after all there’s docking, Bluetooth access but a decided lack of a wireless keyboard.