The first Terminator Salvation teaser trailer is now online at Yahoo! Movies. Bask in it's glory.
From what I hear, it'll be playing before The Dark Knight along with our first look at Watchmen. You couldn't ask for a better theater package. I think I might just explode before I get to see any of it.
Edit: You can click the link above to watch it in HD at Yahoo or you could watch it right here with this pretty satisfactory Youtube version.