From: shanmonster	Date: February 8th, 2007 03:25 pm (UTC)		(Link)

I pronounce it "sizz-em," but used to pronounce it "skizz-em". I can't remember precisely what made me change pronunciations, but I believe it had to do with my history studies at UNB, the professor's pronunciation, and my subsequent look-up of the word in the dictionary.