Hi,
The Mac is also a wonderful platform.
Linux could use a nice Photoshop equivalent. Yes, there is GIMP out there, but I believe it is limited to 256 colors. I'd like to see thousands / millions myself.
FreeCiv is a nice Linux game, along with Chess and the one my fiancee likes... the matching chinese symbols thing that she plays. I think there are a few other games out there for Linux that are Role Playing based. I wouldn't mind seeing a port of Diablo series to Linux.
There are some things that I have to keep my Mac for.... Linux is getting close to Desktop Completion, but not quite there yet. Then again OS X is really a wonderful Unix, although I concede that some things are laid out in a unique fashion. The important thing is that the spyware and bugs just bounce off our environments.
BUT
Any computer system can be compromised. Some a lot easier than others. But a wide open Linux box can cause problems too. Firewall out things that you do not need. If you are running samba internally, make sure your external firewall blocks the ports Samba desires. Don't run an FTP site. Don't run WebDAV externally. Use SSH instead of telnet. Make sure that you have a firewall, and are not running as the root user. And make backups, because hard drives and powersupplies do fail.
Christian