Ok, before I startered this project, I tried to construct the USBasp and USBtiny, and was not successful with bread board. I am planning to make a better version of the USBasp in PCB, but at the moment I tried to make a really small  SI Prog. It will be so small that the entire veroboard will fit into a standard serial port connector casing. I just bought one from Patuatuli:

To fit the veroboard into the small casing, you can maximum fit a 6×6 hole veroboard piece into it, by properly polishing the sides, the central piece could be two hole longer. As the header is inserted into the box, the backside of the header blocks the first row. With only five holes, I thought, at first it would be impossible to fit my circuit (http://sajiduc.blogspot.com/2008/04/beginners-microcontroller-programming.html) here.