They're going to be fried - the electrolyte will have boiled by now. I'm surprised they didn't explode on you.
You're most certainly getting a very noisy 5v output from the 7805.
Be careful removing them you will likely damage the board. Maybe cut the cans off so you can expose the leads on both sides so they present less mass to draw heat away. The solder pads on the board are very thick and suck a lot of heat away from the component through holes.
I wouldn't worry about it until you find replacement caps. The AVR is comparing the high value to a 5v reference that was fluctuating. Same with all the analog inputs.
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