I use anti-seize on the tips of mine now, and remove them occasionally, just to be sure I still can..
My experience has been that the spark plug book sticks to the spark plug porcelain. I use dielectric grease on the tips and the porcelain portions of the plug with great results.
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles