I don't want to see applications that are opened on my other desktops (workspaces) in my Unity launcher (or sidebar, whatever it is called). I find it annoying and would prefer if Unity just dealt with one desktop/workspace at a time.
Is there a way to do this? I have a feeling the answer will be no, but I'm asking anyway... maybe it will be implemented in future versions.
There is a rather lengthy bug-report on just this matter on launchpad.
Even Mark Shuttleworth got involved with this one. However no conclusions or proposals for implementation yet.