[Update: yet more commentary, this time from Brian Krebs - Koobface Worm Targets Java on Mac OS X, and Josep Albors (of ESET''s Spanish partner Ontinet) - Koobface se hace multiplataforma.]
Gradually the entire AV community is getting drawn into this Mac/Linux/Windows malware. Graham Cluley adds some useful commentary on the shiny, newly revamped Sophos blog, saucily entitled Naked Security.
Cross-platform worm targets Facebook users
Meanwhile Jeet Morparia comments for Symantec.
Trojan.Jnanabot: Trojan Affecting Multiple Platforms
And I think I feel a paper coming on. 
David Harley CITP FBCS CISSP
Mac Virus Administrator
Small Blue-Green World
