The patch to solve the SMS vulnerability of the iPhone firmware up to 3.0 is live and available in iTunes. So get on and download the patch (some 280Mb!) before some joker hijacks your phone. Currently Redsn0w is not able to jailbreak it but it seems like just a verification error. Hopefully we’ll get an update for that soon, till now, update to protect yourself or run the risk (although pretty minor) that someone might hi-jack your phone.