I ended up buying a
Avocent SwitchView DVI to port KVM switch over ebay. The switch works perfectly over MorphOS and Windows 7. However if you - like me - are using Ubuntu 9.10 as your primary PC OS you can run into trouble. I had a lot of problems configuring the xorg.conf file correct.
The problem was that Ubuntu (and a lot of other Linux distros) used your monitors
EDID information to calculated the correct resolution. Unfortunately most switches stops the EDID signal comming trough and therefore you have to manually define modelines, disable EDID etc. I have posted my Ubuntu experiences
here if others comes across the same problem.