I've searched for an answer, but things get a little tangled between external monitors and the new iMacs which have more display-sharing options. I have two 20" iMacs - a mid-2007 model and an early-2008 model. Both are identical, save for the 2008 one having a 2.6Ghz Intel Core 2 Duo proc vs a 2.4Ghz proc in the 2007 model. I want to use one of the machines as a second monitor for the other. Is this possible? I have found the ScreenRecycler app which seems to offer this functionality, but I'm a little wary as it looks a little out of date (Lion version still in beta). Any help would be appreciated!