http://penknife.livejournal.com/360228.html?format=light
Her intro: "Soulbonding, or what happens when the author gets out the superglue. I am of two minds about soulbonding in stories. (Let me make it really clear up front that I'm talking about the trope/cliché in fiction in which romantic partners share a mystical link between their souls, not about anything real people get up to.)..."
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There's some K/S in there, a bit of Sentinel, a lot about Mercedes Lackey (I've never read her books but I sure learned a lot from the comments), and a whole bunch of other fandoms. Fascinating discussion.