I have been under the impression that if you want to resaw lumber, the tool of choice is a bandsaw. I don't have a bandsaw, but I do have a contractor-style table saw. However, I have read elsewhere that it isn't safe to resaw lumber on a table saw.
But looking through Mathias Wandel's site, I found a couple places where he resaws lumber using his table saw; like here, for example.
Is this considered safe? If so, what are the rules of resawing on a table saw? I presume I should treat it like a rip cut. Is there a minimum safe length of board, where going shorter would become unsafe? Are there other safety considerations specific to resawing I'm not aware of? (Obviously all the standard rules of table saw safety should still apply: Don't stand directly behind the board being cut, use push sticks, etc.)