Each of us eventually will have a unique Internet address. We owe it to ourselves and the science community to use itas well as our mailing addresses, AIP codes, fax numbers, and phone numberson all correspondence, whether print or electronic. As far as "clutter" is concerned, most Internet addresses are brief enough not much longer than an international telephone number.
...For starters, you can buy a rubber stamp or sticker to update your letterheads to include your street addresses, your phone and fax numbers, and your E-mail addresses.