I build a new dev board for my AVR and Arduino development. My old one really was too small... Since I am daily are working on the evaluation of all the nice and tiny IC's in my electronics box I needed this. Maybe it will become too small in some time but currently it helps me a lot.
It consists of two large breadboards and a wooden panel underneath with four rubber foots. I will work on optimizing this in the future and maybe I will write a document, describing how to build it like mine... ;)