I want to create micro-transactions and am wondering if any of the current crypto currencies have no transaction fees? And if not, is it possible to create a miner that can allow zero-fee transactions?
Oh you just need a client that always make transactions with 0 fee. You should just modify the standard one or find one already modified.
As far as i know every miner just put every transactions in blocks even if they are 0 fee transactions, so no need for a special miner (with "miner" you are speaking about mining and not the bitcoin client right?)