Use widgets on Desktop Lion
YEah! I found the solution.

Turn Off “Dashboard as a Space”
head to System Preferences > Mission Control. 
Uncheck the “Show Dashboard as a space” box and you’ll have the widgets back.

Then again you can go to terminal en type in:
defaults write com.apple.dashboard devmode YES
hit return/enter
then type in: killall Dock (mind the capital D in Dock)
That's it!