So when I ssk, I slip both sts as to knit. My KO sock pattern has me slip as to knit then slip as to purl. (My anniversary sweater pattern says the same thing but I went ahead and did what I've always done). Amy's decrease videos offer both options and she says that some people think slipping the second stitch purlwise makes for a smoother decrease that mimics k2tog more closely. I need to decide what I'm going to do for these socks (when I get that far, which will be awhile!), and I'm curious about what most people do, and why.