We're about to get lost in Lost. David Bianculli's Monday best bets pick the Sci Fi repeats (also available in HD!), but I'd also like to point you toward the cycle beginning Monday on G4, otherwise a gamer/geek channel.
(Not that there's anything wrong with that.)
This run offers ABC's standard Lost episodes Monday-Friday at 4 p.m. ET -- then switches at 9 p.m. ET weeknights to what G4 calls a "2.0 interactive version of the series." Like the channel's pop-up plays of Star Trek, the 2.0 airings add chat-like onscreen factoids and trivia about what you're watching, aimed to illuminate elements of the plot and characters.
(Not to mention get you to watch another hour of G4 programming.)
In this case, the info overload is probably a boon -- Lost is so dense sometimes, so loaded with obscure "clues," that you're not sure who's who, where's where, when's when, or which magic numbers actually add up to anything. Maybe G4 can help clarify.