Some of the best working widgets include Weather, ESPN, and Calendar. On the flip side of the spectrum, Flight Tracker, Dictionary, and Phone Book work terribly.
Hit the jump for full instructions on how to get some widget-y action on your iPhone.
Widgets uses the XLaunch icon and splash screen and the Unknown icon is the wrong size. Sorry about that.
You must install System/Library/WidgetResources from your Mac onto the iPhone. Same folder, same name, same contents. Most Widgets will not run properly without these support files.
Install your widgets into /var/root/Library/Widgets on the iPhone. Widgets.app runs plain old ordinary OS X widgets. You must copy over the entire file structure, so scp -r YourWidget.wdgt root@youriphoneip:/var/root/Library/Widgets is going to be your best bet. And yes, you need to create the Widgets folder if it does not yet exist.