I saw that Plankton-theme showed up in my "Installable Applications" the other night. I installed it, and it supports the system tray well enough, but not the left-side bar. I'm not that fond of the color scheme used for the large menus either (no grey please).

I might have to try my hand at themes for OS2008. There are some themes under WindowBlinds that I'd like to see on the N8x0. I'm hoping that we'll see more themes for OS2008 than we did for OS2007.