so far after one year of various conditions and various uses it has yet to leave a residue. maybe its because i use a good quality tape though (pro-gaff). but you know what, its also a fairly dry climate in southern california so i wonder if that has anything to do with it working so well.

aardvark,
i agree, the quality of electrical tape makes a world of difference. however, even using the scotch brand, after sitting in a warm environment for a while(ie. pants pocket) i still get the residue. but thats not the reason i switched, i just find gaffers tape to be more useful for me all around. especially since i live in one old apartment after another with brittle drywall. i find that gaffers tape won't rip a chuck out of the wall when removed, as other tapes tend to do. and thats important cause i sure do like to get my security deposit back <img src="/images/graemlins/laugh.gif" alt="" />