I have a System76 Lemur Ultra Thin (lemu4) and I installed OpenSuSE 12.2 64 bit which I then proceeded to add the Tumbleweed rolling release software repositories and I performed an update and distribution upgrade. A new friend of mine on the OpenSuSE forums provided me with the device driver and to load the kernel module for my SD card reader. Everything works right out of the box now. I just wanted to let other System76 customers know that OpenSuSE 64 bit is a viable alternative to Canonical's Ubuntu if you are looking for a change.