Pest isn't believed to have attacked users yet, but two examples of malicious software to target Mac OS in two days may signal trend.
http://news.com.com/Bluetooth+worm+targets+Mac+OS+X/2100-7349_3-6041091.html?part=rss&tag=6041091&subj=news
http://news.com.com/Bluetooth+worm+targets+Mac+OS+X/2100-7349_3-6041091.html?part=rss&tag=6041091&subj=news