Some time ago there was a post on the forums here of, what I think, is was the smallest Arduino.
This guy soldered the few components (crystal, capacitor, etc...) that were needed to run Arduino directly to the processor or maybe he used a pin header. Not sure...
I have been looking for that thread last night but not been able to find it. Anyone remembers the thread I talk about and can link me to it?
I am not 100% sure if this was the one I had seen before, it seems close enough. I think the one I had seen here before didn't have the icsp header and also no reset switch.
If anyone has seen other versions, similar to this one, please post!