A researcher has published an as-of-yet un-patched vulnerability in Mac OS X that Secunia rates as "highly critical." And what did we say about the increase in the number of zero-day flaws, boys & girls? Read the Secunia advisory over here, & a news blurb about it here.

"A researcher has posted proof-of-concept code for a zero-day flaw within Mac OS X dealing with its handling of disk image (.dmg) files. The issue causes a memory corruption vulnerability that could allow attackers to execute arbitrary code."