It was pretty simple to insert a step to save the data to Jdrop. The bookmarklet’s display code is easily re-used by wrapping the data in JSON and passing it back to the display code inside Jdrop’s web page. That, in a nutshell, is Jdrop.
Meanwhile, Thomas Fuchs has added Jdrop to his DOM Monster bookmarklet. JDrop is alpha mode, reminds Souders.