I put in the first bits of code needed to make Plasma run properly in a multi-head environment where there's a different X server on each screen, as opposed to the more usual one-X-server-and-multiple-logical-screens.
People have been after me for a while about this one, though no one actually stepped up to address it. It's one of those features where the main users are not often software developers but are pretty aggressive about the feature's importance to them.
Anyways, the first bit of code is in there now and I need testers if this has any hope of working well in KDE 4.4. Which means I need at least one person who uses a dual head set up to install kdelibs and kdebase, at a minimum, from trunk to be my guinea pig(s). I'm working blind here as I don't have a dual head system, so here's your chance to do something positive. You know where to find me: #plasma on irc.freenode.net or on plasma-devel at kde dot org. :)