Jaduka has announced a series of "telephony widgets" through Jaduka Labs:

dukaDIAL: Call any number in the U.S. and Canada for free.

dukaLINK: Create a link to allow someone in the U.S. and Canada for free while keeping your number private

dukaBUZZ: Allow U.S. and Canada visitors to leave voice comments on your website.

dukaBAR: A Firefox or Internet Explorer plugin that converts phone numbers into click-to-call links.

JadukaTV's DuhBate: A fun application that lets you put words in the mouths of presidential candidates and send it off to your friends or post on your blog.

The widgets themselves are neat, and free. It's only the tip of the iceberg as far as Jaduka goes, however.