You've had chances before to keyboardize your iPhone, but never with quite so much elegance. The BoxWave Keyboard Buddy is a smoothly built, adorably named iPhone 4 case that crams in a sliding Bluetooth keyboard.
It's a great solution for those who want their iOS but whose sticky fingertips make onscreen keyboards a chore. And it doesn't look to add too much bulk, as far as these things go. But that's coming from someone who gladly saddles his 3GS with battery case bulk most days.