expose-ish type of application that lets you manage your windows, or similar alt-tab replacement like the windows powertoy which shows thumbnails of your tasks - however that powertoy has problems with some of my apps so a desktopx varient might help. something that tiles your titlebars or icons at the LEAST would be a sure-fire legal alternative.
'sketch pad' - lets you draw either directly on the desktop, or in a whiteboard type setting to make quick doodles - MSN messanger's whiteboard is an excellent example - would love to be able to save desktop doodles as an image (transparent png!!) but saving could be accomplished by an:
'image capture' utility to let you draw a box and save the contents as an image..usefull for taking quick snapsshots of something you are working on to send out.. i think every skinner here could appreciate that.
mail checker - more functional than what we usually see in a checker.. similar to the groupwise notify that lets you see the time and subject line of an incomming message and let you launch the mail app or message, or delete it.. for outlook or hotmail addies. i havn't looked at the VAST amount of mail checkers because most don't do this so i don't know if this has been done.
'alarm clock'
'label colors' to change an icon or icon's text label to a color (yes, yes.. like osx...)
'send to' desktop items.. drag a file over it and it goes off to an email, to a disk, to a zip, or to the internet.
'magnifying glass' - similar to the powertoy but you drag IT over what you want to zoom in on, instead of just zooming up on your cursor
'desktop level mixer controls' for all of your audio devices (dunno about the rest of you but i have like..15 input/output sliders ). martin, you're a god if you can put a speaker fader on the desktop to control front and rear speakers.
smexx's idea of a desktop audio visualizor would be aweesome.
'window-in-window' - lets you bring up your desktop, for example, in a small window on top of everything else so you can a desktop icon.
fun:
grab an icon or window and throw it against the screen and it bounces all over the place. usefull for when SDC is pissing you off.
a clumsy little puppy that chases your curor and tries to jump at it, grabs your cursor and runs off with it if you arn't paying attention.