If you're a little bit of a revhead at heart (like me) you'll probably be happy to know that SBS will be screening Top Gear again later this year. I guess once the season has aired in the UK we'll get it. In response to an email I sent them:
We are pleased to inform you that Top Gear will be returning. The transmission date is sheduled for Monday the 21st August at 7.30pm.
I also mentioned Mythbusters and Iron Chef, but they didn't say anything about those. My guess is they're already definites :)