CURRANB79 I used Desktop Manager on OS 10.4 (for PPC) and LOVED it. When I upgraded to Leopard I was very disappointed with "Spaces" (it was hard to stay on the desktop you wanted to be on--apps kept trying to return to the desktop they'd been opened on, if you toggled between apps on your desktop you were suddenly back on another desktop, etc.) so I disabled it and installed Desktop Manager--but found that it had adopted the same functions as Spaces. I believe I was using 0.5.3 (I'm stuck on a PPC) so I don't know if 0.5.4r1 has overcome whatever it is that makes Spaces so unhelpful.
(Version 0.5.4r1)