I still think that the V for Vendetta movie is one of the best adaptations of a graphic novel out there.
Watchmen was very different in its movie form. It's interesting, because Zack Snyders previous movies (Sin City & The 300) were basically panel by panel remakes.
Recently I managed to get my hands on a first edition print of The Last Ronin, the latest TMNT comic! Expect a review soon :)
Thought bubbles are interesting....personally I also prefer the more abstract approach!