Excellent thank you, I didn't know about the .TTC fonts at all.
There are loads of things I love about the PB. The customizable buttons are fab - I have my on/off button set to show me the last books I've read and love that you can select one to open it - makes reading several books at once as I like to a breeze.
The other thing I really love (not really a tip) is the screen rotation. So many times during the day, I need to rotate so I can read with the other hand - while eating, drinking, making notes, chatting on the phone and cuddling my toddler. I can't get over how easy it is.