I've blogged about this item before at http://cheesycam.com/?p=241. This time around I thought i'd show you what it looks like on video. This is not limited to the 550D, in fact i've owned this special Macro Bellow since the Canon EOS 20D was new. For some reason I'm able to get best results using the 18-55mm kit lens on a cropped camera. It doesn't have Image Stabilization, but this little rail can outperform the $1000 dollar Canon 100mm Macro any day, and it starts for only around $30 bucks. You can find a bunch of these Macro Bellows for sale by clicking here.
This bellow works similar to these Extension Tubes found here.