I'm building up a nice collection of smoked or otherwise bricked Arduino boards. I would like to save bits that might be useful later. I've desoldered a barrel plug to use when I want to separate the power supply to a motor shield. Is there something I could do with the ATmega328 processor, and how would I verify that it is still functional? Any other bits that you rescue?
You can reuse everything what is not damaged, but it can be tricky to properly desolder multi-pin SMD parts.
It's hard to verify if a processor is still working, but it propably is not anymore if you applied a too high voltage on one of the input pins or drew to much current.
Parts like regulators are always handy. I would skip capacitors and resistors.
But you can try to desolder everything, it will teach you how to use e.g. solder wick properly. This will come handy in the future, if you need to replace parts properly! :)