PE:
Don't even worry about it. I have a gas range with electronic ignition connected to a GFCI and it has never tripped.
Oh, and most modern (say 1990 and up) ignitors are totally electronic and are "capacitive discharge" type, not inductive.
Edited to add:
The fan causes the trip because of the high back EMF spike from trying to restart the motor while turning, as the current is not "in step" with the magnetizing forces in the motor. (An oversimplified explanation as I understand it form a handbook on motor load behavior.)
BTW, good idea on alternating circuits between outlets,that makes a lot of sense on how most kitchen appliance seem to be placed and used.!
[This message has been edited by mxslick (edited 03-25-2006).]
