I've seen it 8 times in the theater, and am going to see it at least 3 more times if at all possible! I've collected all sorts of fanfic, fallen in love with Ewan McGregor and Hayden Christensen, started collecting any movie I can find with Ewan in it. I've developed an unhealthy lightsaber obsession, I simply MUST have one, even if it's a cheap plastic one. I bought the Unleashed action figures of Obi Wan and Anakin, even though they don't really look like them, but the concept is truly cool. I've bought a Star Wars video game, and I've also rented the Episode III video game 3 times. I've started doing role plays based almost entirely around rewriting RotS in various ways, because my RP folk and I all agree that the ending really bites... I've also started writing fanfic, I wrote my first one tonight, and I have NEVER EVER written fanfic before, no matter how obsessed I was with something. I also buy foods that have anything Star Wars on it, and I spend countless hours online on this message board and searching the internet for pictures relating to Ewan and Hayden, and making banners and other graphics, all related either to Ewan and/or Hayden or Star Wars.
I'm fortunate to have a cousin who is as obsessed as I am with Episode 3, she's seen it 10 times now in the theater I believe. She and I spend countless hours talking about episode 3 and making up our own bloopers. We even play the quote game and have entire conversations using quotes from Star Wars. This has only happened since the release of Episode III, so all of this is truly in the name of Revenge of the Sith.
I've also ended up with the character of Obi Wan in my head at all times. I cannot get away from him. This is why I sometimes slip into Obi Wan speech. You might notice how I sometimes phrase things rather odd, this is due largely to Obi in my head and also to the fact that I'm just weird to begin with.