I actually thought all three films in the trilogy had really good teasers. But yeah Batman Begins did have an awesome teaser. I think my fav is The Dark Knight though. I've never known another film to generate such excitement for me without using a single bit of footage, but a voiceover and a symbol. I remember sitting in the theater for the simpsons movie back in summer of 2007, that WB logo showed up I nearly peed my pants and went pale when I heard Heath Ledger as The Joker for the very first time...
TDK teaser, damn those were great times. I remember hearing Heath's voice for the first time and talking about it for WEEKS! Don't get me started on the first footage lol.