Don't know if others have seen this or if its 9000 OS specific. If you are running one of the stock themes, go to options > theme then click on the currently active theme and you will notice you can choose these mods:
Wallpaper -- This is obvious, but an alternative to changing your wall.
Layout -- choose either Zen or Today layout for this particular theme. Don't remember Today being a feature before in stock themes on OS 4.
Download Folder -- you can actually choose what folder downloads default to.
If this has been posted before, please forgive and disregard.