I wrote a small AHK script that moves the currently active window to the space reserved by DesktopCoral. Thanks to mouser for his help in this script.
You can find it here: http://www.autohotkey.net/~kli6891/onTop/onTop.ahk
The last version of Desktop Coral is required, 1.07.01 - September 6, 2009.
After running the script, just hit Ctrl+Shift+E to move the active window. The hotkey is configurable, just modify the hotkey value in onTop.ini
See this topic for more info.
Bugs reports, suggestions are welcome.
EDIT: Make sure to Desktop Coral first.