Re: HTML5 <aside> description

If <aside> is not proper to use for this purpose, what would be? <sidebar> suggests a particular type of layout. <section> suggests content. <nav> is appropriate for some items in a side bar, but not all, and is often a child of how <aside> is being used. <div> give no semantics. I would like to see a <toc> tag for nav that serves as a table of contents of sorts (what I often have at the top of a side bar) but I suspect <nav> is considered sufficient. Maybe <sidebar> would be best, and the reference to column type layout can just be understood that isn't necessarily on the side? Reading up on it, I saw some suggest <figure> for what some of you want <aside> used for, but a <figure> is often important content and has its own meaning so that's not exactly appropriate.