Mac users interested in Teamviewer for osx 10.5 generally download:
TeamViewer is one of the best multi-platform tools designed for remote computing. This program might prove to be of good use if you need to immediately connect to someone else's computer to fix a problem or show a user how to complete a certain task.
TeamViewer Host is running as a system service and is used for 24/7 access to remote computers, including login/logout and remote reboot - optimized for server maintenance or home-office access.
Simple and small customer module, runs immediately without installation and does not require administrative rights - optimized for instant support