quickSub is an opensource Javascript popup, designed to allow people to add the ability to quickly subscribe to a feed. Its a little too in-your-face for my money – the popup triggers when you rollover an icon, and you have to click a link to close it. A better method would be to have the click trigger the popup. That said its designed to be used on the standard feed XML button – still I might look at adding it to this blog as a normal hyperlink.