Over the last week there has been quite a bit of press about a new Mac OS X Trojan. Secure as it is, generally speaking, OSX is not bullet-proof, much to the despair of Mac enthusiasts like myself.
Symantec published detectionfor OSX.Lamzev.A on Nov 13th, 2008.
Just to clarify, Sophos had already published detection for this Trojan as Troj/RKOSX-A on 29th August, 2008.
So don't lose sleep over this, Sophos users were protected since the end of August.
Update: The link to Intego's Security Memo talking about OSX.Lamzev.A has been updated to the correct entry.