There should be something like a trade book. You would be able to right click it on other players and it would open a trade window where you could trade goods and services to other players for their goods or services. It would also keep a record of your trading activity. The recipe would be a book and a pencil. To make a pencil the recipe would be one stick and one flint. Please tell me if you like this idea.
Second, why can't players just meet and give each other stuff? I'm assuming this is for SMP.
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This would be easier and you wouldn't have to worry about trusting the person your trading with to trade fairly.