From jill/txt, the title above links to an addendum you can attach to the copyright agreement for a conference or journal paper. Use it to retain your rights to place it on the internet or otherwise distribute your article for non-commercial use, and to request an electronic copy of the final paper. I would guess that most of us in academia neglect to follow the letter of copyright agreements in any case, freely distributing electronic copies of preprint versions to whomever requests and placing them on our academic web sites. Everyone winks at this. Is it better to keep doing it the current way or come out of the closet and use an addendum like this?