I’m an addict as well, I’ve been following the series since the beginning. Since I live in Switzerland, I have to download the episodes so I’m up to speed. TV’s still showing the second season as far as I know. I’ve gotten a friend hooked as well and now we get together every other week to watch two episodes in a row.
I can really recommend LOSTCasts, it’s a podcast that “reads the forums so you don’t have to”. So you get all the theories and easter eggs without having to trawl the forums for hours on end.