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But "You cannot move applications from one desktop to another." is a deal breaker for me.

I normally have three or four desktops open at time. If I open an e-mail related to a particular project, I like to move it to the same desktop as the applications I'm using for that project. Dexpot remains my preferred virtual desktop utility for XP and Vista.

http://www.dexpot.de/index.php?lang=en