Safari Extension to Manage Tabs? I'm looking for a more efficient way to manage my tabs in Safari. Specifically something that allows me to move multiple tabs at once to a new window.

I often find myself following a link for a new subject/idea, then another, and so on and so on, until I find myself with a dozen tabs that should really be in their own window, but it's a pain to manually find and drag each one. I'd love to be able to do it in one fell swoop. Any suggestions?
Poor mans answer - I use XMarks and do any management I need in their web interface. However Safari is close to getting the boot on my mac since I can only see 13 open tabs.