Certainly not throwing it into the trash bin.
I think countries should look into their coins. For example here in New Zealand we have only $2, $1, $.50, $0.20 and $.10 coins, which is great. All shops round the final price to the closest $.10 amount.
In Europe you have something like 2, 1, .50, .20, .10, .05, .02 and .01 coins. There's nothing you could buy for .02 or .01. The nominal value of the coin is likely lower than the material value. People take it out of the system and have it in huge glass bottles at home... sometimes for many many years. Therefore the Central Bank has to produce more and more of those useless coins.
In New Zealand I keep all the coins in my pocket and use it next time buying something.