With 'Lost', we've seen the characters featured in flashbacks, flash-forwards, and now for the sixth season, "Team Darlton" will be giving us "flash-sideways". In these, we'll be seeing what life would have been like for the characters had they not crashed on "Crap-hole Island".
Just based on the examples we saw in the Season Six premiere, they turned out better with the crash - even if they ultimately died there.
A fellow member of the Idiot's Delight Digest, an online group centered around the radio shows of Vin Scelsa, told me where "Cuselof" may have found that phrase:
That's from the movie "Funny Farm" where Chevy's wife is describing his novel... "In the first twenty pages alone, I counted three flashbacks, one flash forward, and on page eighteen I think you have a flash sideways!" - Ray
I can always count on a fellow Iddiot for trivia like that!