If you bought in Dec 2008, it is quite possible you have an Intel Mac and can get Lion. Right now the only way I know of to get Lion is to get Snow Leopard first so it would cost $29 for a Snow Leopard DVD, then you sit through the updates to get the app store then you pay $29 in the app store to get Lion and sit through a 3.7 gig download. I would wait to see if Apple provides a direct path from Leopard to Lion before spending the extra $30. I've heard you can get Lion in an Apple store via some sort of "local download" but again I doubt they have worked out the kinks to go from Leopard to Lion because there was a "migration assistant update" that had to run on 10.6.8 before I was able to install Lion. If there is a migration assistant update for 10.5.8 in the next few days or weeks, that would be a strong clue that Apple is working on a direct migration path from Leopard to Lion so they can sell to those users who opted to skip Snow Leopard.