This is a neat feature of the ROX-Filer but it seems that very few people know about it or even tried it. I myself have long regarded it as a gimmick.
@geo_c once started the thread I like Rox's Iconified Windows. It soon went OT and nobody seemed to be sure what "iconified windows" are eventually good for.
So what are they? Pretty simple: Whenever a user minimizes a window, an icon representing this window is placed on the desktop.
Why is this neat?
1) When you have many windows, minimized or not, on the deskop, tabs of these windows appear in the taskbar, but with increasing number of windows the width of these tabs get smaller and smaller. Once minimizing a window it becomes difficult to restore this window, simply because it's hard to find it again in all these tabs. Here ROX's "iconidfied window" icons come to the rescue. These icons are big and their title is not truncated, removing all guess work.
2) The most important feature for me is the a ability to restore a minimized window from any desktop, not just the desktop where it was minimized. For this to work the "Show per workspace" checkbox must be unchecked. Let's say you have a leafpad window open on desktop 9. After minimizing it you can switch to desktop 2 and restore it on desktop 2. This means you can "park" windows for later use without the need to remember where you parked it.
Just try it. It doesn't hurt, doesn't cost extra and it's easy to disable if you don't like it