I used to use Backdrop but now use Camouflage instead, because I frequently hit cmd-option-H to hide all others apps. Problem is, it hides Backdrop as well, revealing my desktop icons. No good! This doesn't happen with Camouflage, so it gets my vote.

I just leave Camouflage on all the time and open a Finder window if I need something on my Desktop. I love a clean look.

For this job, isolator is also quite nice: eg: it can cover the desktop with black, with an certain percentage of transparency.

well the ram usage depends on the images that you are using. I tried to keep the memory usage low, but if you're using huge pictures and using a huge monitor this will reflect in the memory usage.

Awesome app, but tends to use a ton of RAM (100+ MB)

I really enjoy this app because it's a great way of focusing my attention on one specific task be it in a window or in an application.

A really nice tip I have to offer, if you have a laptop with SideTrack installed, is to map the hotkey to one of the screen corners - that way you can invoke Camouflage with just a trackpad corner tap.