One more off the top of my head:

hlynn had Glory remove it in "Sideways Shanshu"

And I can remember another story, though the title and author are totally escaping me. It was written around the end of Season Four, and had Spike's chip get fried after he's slammed into a breaker box or something similar while fighting a demon. He gets all geared up to go kill Buffy and winds up realizing he loves her. I haven't read it in ages, though I know I saved a copy. Have to keep looking.