There's already some shenanigans going on related to the next Batman movie:

A few days ago, a viral website for The Dark Knight surfaced, and we got the first glimpse of Heath Ledger as The Joker. Now that site, IBelieveInHarveyDentToo.com, has changed.

Go there, and you'll see a message that says "Page not found." If you highlight the page, however, you'll see a series of Joker-esque "ha ha"s. Pop reader Paul S. points out a hidden message between the "has" spells out "See you in December." Could this be a hint as to when we might see the first trailer for the movie, or is The Joker just playing with us again?

Pretty sweet...I hope they have some kind of internet puzzle going on to promote the movie and these are just the first pieces.