I find myself using the highlighter to organize text. I like very much that I can just click the icon in the tool bar. This is a very small refinement, but it might be nice to have the ability to place multiple “pens” on the tool bar, to which we can assign different colors.
I think that could be horribly cluttered (having lots of highlighter icons in the toolbar)… You do know that if you hold down the toolbar icon, a list pops up with the other colours, though? The next update gets rid of the highlighter toolbar item altogether, mind, and places it in a format bar similar to that of Pages.
All the best,