Reading a few articles a few months ago here and here about moving towards a cashless society.
The main pro I supposes would be a drastic reduction on crime and corruption, from muggings to bribery.
The cons, as I see them would be that in the event of a real or perceived imminent banking or equity collapse people often withdraw savings and store them in cash-this option would be no longer available. I also see cash as a form of independence and privacy- I would rather that the bank and/or government did not have the power to see every transaction I make.
There is also the problem that we still have laws where victimless crimes, specifically the drug trade, are prohibited. Cash allows the average punter to vote with his wallet if he or she so chooses.
Smaller things would be ease for tipping, giving kids money for birthdays, selling goods to friends and so on. I'm sure there are others that I cannot think of. While minor points they should be taken on board nonetheless.
In short, I think that cash is freedom, and we should never let our government or banks try to take it away from us. What do you think?