One of the things I really liked about Alias in the early seasons was how almost every episode ended with a cliffhanger, which made the week-long wait for the next episode a chore. IIRC, that was something they dropped around the middle of the series (perhaps it just got old?), but even rewatching on DVD, if you just plan to watch one episode at a time, and an episode ends on a tantalizing, edge-of-your-seat note, you can't help but watch "just one more". Next thing you know, you're on your 5th episode... They're almost like Ruffles chips -- you can't just [watch] one.