Did they come back in their original form?
Star Trek came back first as a animation (with original cast), later with different timeframe/cast as TNG, later followed by other Star Trek "versions"; The Odd Couple was cancelled, then following strong ratings during summer reruns was picked back up; Taxi was cancelled, then immediately picked up on another network; and Baywatch was cancelled by NBC then returned in the first-run syndication market.
And then there's The Three Stooges, with their newest film coming out in summer of 2010...