I know I'm probably the last person to get hooked on Lost. I try not to watch a lot of tv, but after hearing so much about Season 2 I decided to watch first few episodes from Season 1. After watching the pilot, I was addicted.
To watch the first season as fast as possible and catch up, I got the 7 discs from Netflix, Blockbuster Online, and even the last two from my local Blockbuster store (they counted as one rental). To catch up on Season 2, I downloaded a few episodes from iTunes for $1.99 each. I know I could have used BitTorrent to download them for free (illegally), but this gave me an excuse to try iTunes Video downloads. I also set my Windows XP Media Center PC to record Season 2 while I was watching Season 1. I liked the excuse to use several different technologies (that didn't exist a few years ago) to watch an entire season of tv in a few weeks -- legally.