EFO just recently released a credit card size bluetooth keyboard. I hope they make one that comes with a case to fit the Iphone, that would just be awesome to flip it open and use the Iphone laptop style 
source: http://efo.buy-lowest.com/index.php?main_page=product_info&cPath=77&products_id=234
Go to Source: http://feedproxy.google.com/~r/Mytechisland/~3/12fhC9W-zPg/smallest-credit-card-size-bluetooth.html
Via BFWGaming