First, there are the old ones. And I just discovered a new old one. Apparently in 1979, a comic version came out.
Then in 1988, they came out with this one:
I watched this. It was terrible. There's a full rant about it on this blog, since I reviewed it several months ago.
And then, oh joy.
The 2005 version of The Lion, the Witch, and the Wardrobe. It's totally awesome, and while not perfect to the book in a few semi-minor things, it is a excellent watch.
Soon after, in 2008:
Love. I love that movie. Now I should mention here that there is an objectionable scene...namely, some pretty serious black magic. I always skip that. A few other things are also added (eg, romance between Caspian and Susan), but overall, I like the movie better than the book.
And now, in December 2010, Voyage of the Dawn Treader came out. I saw it twice in theaters, but not since then, so hopefully soon, another review will be coming from my watching it again!
I liked it. Yes, I know, it strayed from the book, but the essentials (to me) were still there. I recommend it.
Now there was, also in the 1980's, a combined version of Prince Caspian and Voyage of the Dawn Treader, and it's another that I haven't seen. However, if it's anything like the old LWW, it's not worth it.