I was gunna do that to fiddle around with FaceBook Connect a bit, but apparently ya need to give FB a mobile phone or credit card number to "confirm your account" or whatever in order to get a developer account.
However, what I used in a non-vB site which would still probably work (and that you don't need a developer account for) can be found here:
http://developers.facebook.com/docs/...gins/like-box/
I just changed the URL in the HTML it spat out at me.... And I would guess it would work if you put in the post URL with a variable for the post ID in your template, yah?