We recently upgraded to Leopard, and didn't save each Sticky Note individually, but we did back up the entire computer on a removable drive... is there a way to use the data from the back-up file to reconstitute the Stickies on the new Desktop?
Not sure why your original stickies file didn't stick around as is, but it's located in your Home Library folder: StickiesDatabase. Try putting this file from the backup in the same place on the upgraded side and see if it works.
- Ben