Since your question about Unchecky was deep in the replies to another question I thought that I ought to reply using a new thread.
I have been using Unchecky since December and it does what it promises. I'm not sure that it catches fully 100% of the extras but it does a good job.
Also those 30-day free trial periods in the video are for the installations such as μTorrent and BitTorrent for which the action of Unchecky is being demonstrated, not for Unchecky itself.
Here's the link again (saves you having to find it in the original thread)
http://unchecky.com/