It seems that I bought the last ones because there are currently no more of them in his shop available... :( But I think you could get one in the near future again. If not take a look at his site. All code and schematics are freely available there.
Soldering was a lot of fun and very easy to do. After successful soldering I build the small circuit at the end of the howto and flashed the microcontroller using the Makefile provided by Alex. I needed to change some things to make it work right on my Linux box using avrdude and the Atmel AVRISP mkII.
I changed the PROGRAMMER line to:
PROGRAMMER = -P usb -c avrispmkII
If you even get errors, try to add the parameters "-F" and "-D" to $PROGRAMMER. Call "avrdude --help" to get a description of these parameters... ;)
Don't forget to add an external power supply to the header board since the AVRISP not seems to provide enough power. I got strange errors in the output of avrdude. After adding more power everything worked as expected.
The result: A blinking LED. Yeah! :)