Alt-tab does not display all applications

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http://askubuntu.com – So far I'm loving 12.04. I have read about several Alt-Tab issues, but none that sound like the one I'm encountering. When I have Skype running, I can't alt-tab back to it. I can get back to it with the "window spread" navigation (Shift+Alt+Up), but that only works for non-minimized windows. If Skype has been minimized, there is no way** to get back to it. Is there a way to allow Skype to show up in the alt-tab menu? Are there other applications that also don't show up? Thanks! ** Actually, it is possible to get back to it by enabling the Skype taskbar icon, but that doesn't solve th (HowTos)