Apple is planning to release an update in the near future specifically to deal with the MacDefender malware that’s been making the rounds for the last couple of weeks. There’s blood in the water now, though – I wouldn’t be surprised to see significant amounts of new malware on OS X in the near future, now that it’s a proven target.
And, in related news, a new variant apparently doesn’t require an admin password any more.
http://arstechnica.com/apple/news/2011/05/new-mac-defender-malware-variant-drops-admin-password-requirement.ars