It’s got a kickass compression algorithm, no doubt about that.

 
Today I realized that just because it’s an open source freeware hippie project, it justifies them to have a big fat button named “Background” in the extracting dialog. The button should of course make the window reside in the tray bar. But NO – no matter how many times you push it - nothing happens, nada! I want to do this every time I extract something.

 
They’ve had this dummy button in their latest stable version for several months. We’re dealing with a bunch of really dedicated good programmers, but apparently They Can’t Fix This Annoyance, and who blames them? They’re holy open sourcerers. I say fix it!

 Get it now - http://www.7-zip.org

 Edit: After this article I was told that the button is used to toggle the working thread priority. But hey; that's no good GUI design.