There is no grammar rule in this world that frustrates me more than figuring out which version of lay or lie I should use in a particular situation.

Grammar Girl (genuflect when you say that) put the transcript to her podcast about this issue up on her web site along with a helpful table that explains how to use them.

So, go read “Lay Versus Lie”. These things do matter. Perhaps one of these days this issue will stop vexing me.