I purchased iLife 08 when I purchased Leopard. However, I am not sure if I should open the box or not, and install iLife. I am currently running iLife '05 and it does what I need it to. However, are the features so good in '08 that I should keep the software and upgrade? When I get another computer with 08 on it, will it be compatable with my '05 on my current computer? THanks for any advice.