According to ZDNet if you are one of those who downloaded a pirate copy of iWork 09 from torrent sites then your loved Mac might be part of a botnet now...

" Writing in the current issue of Virus Bulletin (subscription required), researchers Mario Ballano Barcena and Alfredo Pesoli found two malware variants — OSX.Iservice and OSX.Iservice.B — using different techniques to obtain the user’s password and take control of the infected Mac machine.

The variants have been found inside bogus copies of iWork ’09 and Adobe Photoshop CS4 which were shared on the popular p2p torrent network. The author of the malware downloaded the original/trial versions of each program and introduced a copy of the malicious binary into the packages.  Users who then downloaded and installed the applications from the torrent download would have been infected. It is estimated that thousands of people have downloaded the infected torrent files."