Formpad
Formpad is a tool you can use with del.icio.us or any other bookmarking tool. You'll need a desktop browser to set it up at, http://wampad.com/fw/. When you click on a dynamic link in del.icio.us, it will be sent through a script that will look for values like {Query} and build a dynamic form for you to fill out. It will then redirect you to the final destination with the values like {Query} replaced with what you entered.