Apple has just released update 1.1.1 for the iPhone.  It addresses at least 10 security issues (based on counting the CVE numbers in their announcement), so iPhone users (at least those who haven't "unlocked" theirs) should probably update soon.  One of the fixes addresses bluetooth, 2 address Mail, and 7 address issues with Safari.  For those who have "unlocked" their iPhones, there were stories in the press over the last week that a future update would turn the unlocked iPhones into expensive paperweights.  It is unclear at present if this update is the one that does it or not (probably not based on the descriptions of the updates included).  Note: We (SANS, the SANS ISC handlers, and me, personally) hold no position on whether or not unlocking the iPhone is a "good" or "bad" idea, we're just passing along the info.

Apple's bulletin: http://docs.info.apple.com/article.html?artnum=306586