Speaking of sequels, Dark Knight with Heath Ledger is getting a lot of positive signs thus far. I was under the impression that it was a sequel to Batman??? Am I right or is his character a "joker type" character.

Anyway, this morning they are saying how great Heath's performance is and that there is oscar buzz for it. They commented that this is a very "dark" film and from what I have seen in the brief previews, it looks like it.
They also say although the movie doesn't open for weeks yet, tickets are selling out. I think someone here posted about it, but what exactly is the storyline if you know.
I am not really a Batman fan, but admit these previews are intriguing.
TIS
I did find out that it IS a Batman flick. However, from these scenes it sure doesn't seem too "cartoonish".
http://movies.yahoo.com/feature/thedarkknight.html?showVideo=1