Fedex is an interesting thought, and I would think that it would get through the clutter and at least get someone to see what it is before tossing it...which is really all one can hope for. ...but, it would get expensive fast. ...if you had your sales pitch right, maybe even calling....with smaller businesses you have more of a chance of talking with the same person that would be opening the mail anyway. My personal approach would be to be open...I've got this domain that is selling shortly and I was wondering if they would have an interest. No big sales job, they are interested or not.
Postcards are an interesting idea, I would be very interested in knowing how the response goes.
DC20