UniDo is a MySQL driven note taking application. That means that if you update your notes on your computer(or someone else's, for that matter), it'll show the updated version on your iPhone, and vice versa.

It'll autodetect if you're on an iPhone or not, and display differently if you view it on an iPhone(designed with iPhone UI/load speeds in mind) and a computer version with more complex layout and graphics.

UniDo is donationware, and is available at:
http://unido.maxwelldev.com