gDesklets do work in KDE actually, they'll work in just about any WM/DE. SuperKaramba is kinda of the same thing but for KDE, and it kinda only works for KDE too. (it'll run on with any DE/WM, but the transparency won't work)
Here's a link for superkaramba. http://netdragon.sourceforge.net/ and you can get themes for it at http//kde-look.org
But if you'd' rather try gDesklets, you can find the info you need at http://gdesklets.gnomedesktop.org