This is a win-win-win situation.
#1. This show is awesome. If you've ever laughed during 30 Rock, you owe this show a chance, because without it, Tina Fey's show could have never existed.
#2. Thanks to you, the non-watcher, this show is no longer on the air. (Thanks, jerk.) There's no further commitment involved.
#3. The entire series is available on Hulu. SCORE.
#4. They are (fingers crossed) probably making Arrested Development: The Movie for a 2010 release. So even though there's no commitment involved, you'll be able to appreciate the awesome of the movie when it comes out next year.
Arrested Development tells the story of Michael Bluth, who plays the unwitting straight man to his family of lunatics. (His mom, Lucille, is one of the greatest television characters of all time.) Michael's father has been sent to prison for various fraudulent business activities, and for the family to stay afloat, Michael has to run the company and the household. (Nobody else could possibly keep it together.)
You will laugh so hard you'll cry.