A few years ago I wrote three widgets for Konfabulator, which was a precursor to the Macintosh Dashboard and the Windows Vista sidebar. Later, Konfabulator was purchased by Yahoo.
MagneticPoetryWorks like the magnetic poetry on your fridge. Customizable set of words to use. Simple, straightforward.
GetInformationDrag a file or folder onto GetInformation to get information on the file. Shows the name, location, size, permissions, and last-modified date of the item.
BetterWhatsGoingOnBased on the original Widget WhatsGoingOn by Oriol Ferrer, BetterWhatsGoingOn adds more information. BWGO displays the day and time, the uptime, the top four CPU processes, free memory and CPU.
These used to be available from Yahoo but now seem to be no longer there.