Here are some things that I'd like to see. Some are probably already in Konfabulator but I haven't checked that lately. Some may also be beyond the limits of javascript.. but that is not for me to decide.
1: A VersionTracker Widget that would list new updates with links to the VT page.
2: A Dictionary/Thesaurus that would access an online dictionary, or several.
3: A widget that tells me when someone uploads something to my iDisk Public Folder, or any public folder for that matter.
4: An alarm clock/timer
5: An iChat buddy list / status widget, that would not require iChat to be launched, and would show buddies whose status is away as well as available (unlike the iChat status menu).
6: A widget that could contain the contents of all or some links in the Safari Bookmarks. This would allow access to these bookmarks in whatever browser is set as default. A plus would be if the widget could also save the current link in the active browser to the safari bookmarks. This would alow for switching browsers allot (something I do) but also maintaining one synchable bookmark database (something that I would like to do).
7: A widget that would create reminder alerts for my iCal To Do items.