Say you want to buy a new Sharp LCD. You pick out a model on Amazon or Best Buy, and while you're inspecting the product page, a small drop-down may inform you that Buy.com (or one of 50 other comparison stores) has the television for 1% cheaper than where you were shopping.

It's not the only plug-in of its kind, and I was able to beat that tested deal pictured above by searching myself, but the visually quiet interface may keep you from uninstalling the thing by the end of the week.

As an Amazon addict (on small purchases), I've basically sold my soul for convenience, accepting that 5 minutes of googling may have saved me 20 cents. But having the comparison shopping cruising in the background...we'll see whether or not I reassess that position (whether I'm cheaper than I am lazy). [Invisible Hand via Red Ferret via LifeHacker]

The completed ship is 231 studs long (that's almost 73 inches, for us non-Lego-geeks), 41 studs wide and weighs about 30 pounds. It's packed with attention to detail that has to be seen to be believed, down to different antenna sizes dotted around the tower and complex engine-plumbing. Mark's decision to avoid too many exposed studs must have added considerably to both the expense and building time, but has resulted in something that looks almost like a prop from a Lucas' set.

Whether you think "dedication to hobby" or "Lego nutcase in action," you've got to admit its pretty awesome. Now, who on Earth would think of taking on a project like that? [Lego Invisible Hand via Brothers Brick]