I'd like to see a bit more effort spent on styling. To me is really important to be able to choose the right fonts and be able to style text differently much like Pages while taking my notes. I know I can change the default font, mut this is not enough for me. Moreover, if you select a different, more comfortable lineheight you cannot specify to save it as a default, so you need to redefine the rule for every other note you take.
I'd also like to see Markdown implemented in some way.
About sharing, I think I'd like to be able to post notes on my webblog (Wordpress or ExpressionEngine) more then publishing static pages PearNote branded.
Finally, a full-screen mode (if you don't have to follow slides..) is welcome.
What do you think?