In an earlier version of Ubuntu with Compiz I'm pretty sure there was a useful setting to enable seeing what's behind the current window by clicking and holding the title bar, which then changed the current window's opacity to something like 10 percent.
Is there any way to achieve this in Ubuntu 11.10?
Have you tried https://launchpad.net/~unity-team/+archive/compiz-testing
add this to your sources.list
deb http://ppa.launchpad.net/unity-team/compiz-testing/ubuntu oneiric main deb-src http://ppa.launchpad.net/unity-team/compiz-testing/ubuntu oneiric main
Or
You can update your system with unsupported packages from this untrusted PPA by adding
ppa:unity-team/compiz-testing
to your system's Software Sourcesyou will also want to add this