hmmm - interesting - I had cover switch working with KDE4 before upgrading to version 2010. Since then however, it has not worked. When I go into "Configure Your Desktop" and Desktop Effects, I get the information message the Compositing has been disabled because XComposite and XDamage are not available. When I check in Synaptic however, I see that libxcomposite1 and libxdamage1 are installed. Would like to get Cover Switch back again but it seems some components are missing. Any ideas as to what is needed to get this working once again?