A cool use for the del.icio.us extension for Firefox which just occurred to me: Since you can bookmark & tag links directly in place on the page with a right-click, without visiting them, I can pluck an MP3 straight from an inline link and route it to my iPod by way of a podcast subscription to my system:media:audio tag feed. I'll be listening to this OPML podcast on the way into work in the morning thanks to this trick.