Al McGee (see link on blogroll on the left) kindly sent me this article on theosis by Mark Shuttleworth. It’s an excellent article, and a good one to send to Protestant family/friends. There’s even a quote from C.S. Lewis from his book, Mere Christianity.
Theosis: Partaking of the Divine Nature

I think that we often forget what an opportunity we have to experience reality. We are constantly distracted and our life is passing us by. But we can live a whole life, this very moment, full of joy, as we pray for theosis.