I wasn't in a rush to upgrade to iOS 4.2, but when I plugged my iPhone into my lappy and the upgrade window came up and outlined some of the changes I squealed with joy! New Fonts for Notes! Oh, yeah baby! Download that thing!
Helvetica is SO much nicer for a grocery list than Marker Felt. The writing on an iPhone Note is tiny, like 7 point. It's idiotic for it to simulate what you might write on a white board. I am SOO HAPPYYYYY to be able to change it to Helvetica.
You can pick from three fonts now in Settings -- Chalkboard, Helvetica, and Marker Felt. Chalkboard is at least better than Marker Felt, but Helvetica is the real deal.