SuSE Linux 10.1 installs fine on the A1667G. However, the installation of the graphics card and WLAN drivers are a little bit tricky.
For the WLAN drivers, use the latest ndiswrapper version together with the 64bit drivers provided by Fujitsum Siemens.
For the ATI graphics card drivers, nice instructions are available:
http://linux.wordpress.com/2006/05/12/suse-101-ati-drivers-installation/
When you have problems with the soundcard, make sure that you check the "VIA DXS" sliders in the mixer.
The Infrared control is not working for some reason.
Bill Giannikos has added some information regarding Linux on the Amilo A1667G to the Linux Laptop Wiki.