You can now use the MeeGo style "swipe to unlock" feature on your Nokia belle devices thanks to SwipeUnlock app from the Nokia Store.
Though it doesn't have the FULL features as seen on the N9, it is impressive nonetheless. you can choose to swipe horizontally or vertically (but not both ways at the same time), and the swipe unlock app doesn't work with the unlock button on the side of your N8, you will have to first press the "menu" button to use it.
It does feature push notifications which really look cool, kudos to the developer of this app Alexander Fokin for a job well done.
See the video Demo:
You can get this MeeGo style unlock feature from the Nokia Store for $1.99
Get it HERE