[quote name=\'Jimmy Owen\' date=\'Mar 21 2006, 01:16 PM\']There was a guy who competed against Ken Jennings who appeared weekly on a different game show as host/quizmaster. Not Canadian, though.[/quote]
Yes, but that was in an invitational tournament, where their regular eligibility rules don't apply.
From all I've heard from varying contestant departments, the spirit of the rule lies in whether any significant chunk of their national audience would have seen you. As such, my guess is that First Comes Love may be held against you, but anything that didn't air in the US wouldn't.
But don't take my word for it. You can call the J! contestant department directly "at 310.244.5367 between 10 am and 4 pm PST for more information." (per the J! website)