A new report shows that Apple has the most software vulnerabilities of all major software vendors, though it doesn't address severity or how fast holes get patched.
Secunia issues Safari vulnerability advisory
A nontraditional test using exploits instead of malware shows that traditional security suites fail.
Secunia: "shared_region_map_file_np()" Denial of Service in Mac OS X
The excellent Online Software Inspector has a couple new minor problems. Still, it's a great service for anyone running Windows.
Secunia reports "Frame Injection" vulnerability that affects Safari, other browsers
Secunia: Virex for Mac OS X security flaw reported, patched
Secunia: Mac OS X ftpd Buffer Overflow Vulnerability
Secunia issues "less critical" OS X security alert
Photoshop CS3 (#6): Two major security vulnerabilities extant, according to Secunia; continued installation issues