bluetooth/non-bluetooth portable keyboard?

Hi,

I am looking for a fold up keyboard for my iphone so that I can type notes in class. I don't care if it is bluetooth or not bluetooth...actually, I don't think iphone OS 3.0 currently supports a bluetooth keyboard, so I am looking for any type of portable keyboard that could plug into the iphone....I have an otterbox defender case on my phone, so I wouldn't be able to dock it on the keyboard...it would just have to have a cord that could plug into the bottom of the phone.

About 6 years ago I noticed a fella in class with some sort of palm pda with a portable keyboard...he was typing away...I know this technology must exist somewhere for iphone if it existed for the palm pilot years ago!

Thanks for all your help! I was considering buying a livescribe pen, but I would prefer to type my notes in class and not lug around my macbook to do so!