Aliens in America. You'll be glad you did.
It's been cancelled, so this isn't a save-this-show effort. But over the past year, I've had three favorite shows: Lost and Mad Men, tied for first place. (Not a competition because they don't run at the same time of year.) Number three (or two, depending on how you count) was Aliens in America. It's like The Wonder Years, Freaks and Geeks, and Arrested Development all rolled into one. It's funny, poignant, smart, sweet, clever, and cancelled.
It's not too late to watch: episodes are still rerunning on the CW on Sundays at 8:30 pm EST, but full episodes are also online here.
I think I got them all recorded and saved to the DVR, awaiting my finding time to rename them and burn them. That's the only thing about all this that makes me happy. The CW can cancel all it likes, but I'll have the 18 little gems of Season Only as long as DVD technology is still playable.