Installing Debian Wheezy Linux 3.8.7 with FHEM 5.3 contained onto a SD card:

download:
http://files.busware.de/tuxradio2/tuxradio2.img.zip

un-zip:
unzip tuxradio2.img.zip

copy to a (min 2GB) SD card:
dd if=tuxradio2.img of=/dev/sd<your sd card>

Windows users may use: http://sourceforge.net/projects/win32diskimager/

boot the card @ TuxRadio2

You may resize the root partition (/dev/mmcblk0p3) once successfully booted 
reflecting the actual capacity of your sd card.

Make sure you use sd cards labeled "Class 6" or "Class 10" for speed reasons.