The release of iBooks 1.5 offers an interesting swap out. My three least favorite fonts for reading on screen were removed: Baskerville, Cochin, and Verdana have been erased from the list. Only the dread Times New Roman remains alongside Georgia and Palatino. Added into the mix are four other faces: Athelas, Charter, Iowan, and Seravek. Only one of these I was familiar with.
The screenshots of the new fonts are a nice touch. I like reading with Verdana at small sizes on the iPhone, but maybe I could replace Baskerville in Instapaper with one of those nicer serifs.