How to import dashboard stickies from an old hard disk without using migration assistant?
You'll need to copy two files from the old installation of OSX:

~/Library/Preferences/com.apple.dashboard.plist
~/Library/Preferences/widget-com.apple.widget.stickies.plist


The first tells Dashboard which Widgets to show, the second contains your notes.

Copy these to your new ~/Library/Preferences and you should be good.

You'll need to restart, logout and login, or kill the Dock, for example by opening Terminal and running killall Dock.

It worked for me - but I should warn that my home path was the same on the old install and new install.