Tip: Bookmarklet for creating those POST urls

As you probably know, you can tell YubNub to do a POST instead of a GET by putting [post] somewhere in the URL when you create the command (thank Sean O'Hagan for adding that capability).

But it can be a headache to try to construct the URL by looking at the HTML source. So go to Stephen Ostermiller's bookmarklets and drag his "Forms To GET" bookmarklet to your toolbar. Then press it to convert that POST form to a GET form so you can see the parameters in your address bar when you submit it.