You could go the PU route, gives you plenty of space to tack parts on the back like here to make up a little system like here:http://www.geocities.jp/arduino_diecimila/obaka/project-2/index_en.html
But its not for what I want - that's a 0.6" wide, 40 pin part.
I am after something more standalone.
Hmm - I could also see taking advantage of the wider body/longer length to make a PCB that could be loaded up with components and glued to the back of chip with just the few connections needed to connect to FTDI programmer, Xtal, caps, reset switch, to have a part that could be installed in a socket.
At the same time, I am thinking if I am going to socket it, on a board, why not just have the other parts on the board also?
Waffling, waffling ...