Simple, effective, and useful Rated 5 out of 5 stars
A very simple extension that works right out the box, exactly as it should. All Flash gets replaced by the Flashblock logo, and clicking on the logo allows the Flash to load. If there's a site you frequent that has Flash content you want to see, a simple right-click gives you the option to add that site to the whitelist.
Whether you want to disable Flash to save bandwidth, to save CPU, or to save your sanity, Flashblock is the answer. I'd recommend it to anyone.