i did a clean install on my dual 2 G5. i was using the stickies widget to hold a lot of contacts. i've backed everything up but i can't seem to find the file that would contain all of the information i had on those stickies widgets. this is not the stickies program, but the stickies widget. i'm on OS 10.4.7
Your Stickies Widget data is in the file ~/Library/Preferences/widget-com.apple.widget.stickies.plist. If for some reason the info doesn't appear in your Stickies widget after replacing the prefs file with the original, you can open the prefs file in a text editor and retrieve the important info that way.
It's a good idea to do regular backups of all your important files, settings, passwords, etc. If you have .Mac or a second hard drive and an application like Carbon Copy Cloner its pretty easy.
P.S. the Widgets in your ~/Library/widgets and /Library/widgets folders are Package's. That means if you right click (control click if you're living in the 80's) and choose "Open Package Contents." Inside you'll find additional files, images and preferences to control your widgets.