Every now and then WindowShade would be dazzlingly useful to keep me productive. Mostly though I just liked it to be playing a mini-iTunes player window in the corner of my screen while I worked. For this, I just used the part of it that let me keep a window on top of other windows, but that was just one of the things you can have it do. It was worth it.
Migration Score
GOOD
Migration Options
Compiz Settings
No separate application is needed- just use Compiz. Install CompizConfig Settings Manager if you haven't already. Go to the 'Extra WM Actions' in the 'Window Manager' section. Find the option named 'Toggle Always-On-Top' and click the 'Disabled' button to the right of it. Check the 'Enable' box and then it will prompt you to choose a hotkey to control it. Use the 'Grab key combination' button and just type what you want it to be. I chose