I recently purchased a MacBookPro (a big step up from my iMac 2006 that was running Leopard.) I transferred all of my data from the iMac (which included iDVD 6.0.4) to the MBP, which was purchased with Lion. I did not take the time to download an updated version of iDVD before I took advantage of the free Mountain Lion download. Now I am finding that the iDVD app has a circle with a line going through it. When I click on it anyway, it says "You can't open the application "iDVD" because PowerPC applications are no longer supported." I tried to download updated versions of iDVD at that point, and I get this message: "An eligible iDVD application was not found in the location/Applications." Does anyone think that if I had updated iDVD BEFORE making the switch to Mountain Lion that I would be able to run the application? I used iDVD quite a bit, and I will be very disappointed with Apple if I am unable to use it. Is there a way for me to temporarily go back to Lion without losing everything so that I could try downloading an updated version of iDVD before going back over to Mountain Lion?