WOW, that was kickass! :D The Buffy-verse girls were awesome - the portable devils trap is genius, and I like Willow getting all earnest, wanting to tell about the ritual thing. :) And Al...was Al. Heh.

Very nice plot flow, now it looks like all that's left is to tie up loose ends in the (relative) past. Dean's plan was awesome, so yeah, Sammy should just shut up becuase Dean is the awesomest big brother ever. :D The little description of Sam's reaction was particularly amusing (hee, the mental image of Sam flailing around like he's trying to fly is just so funny! :D)