Check out our gallery and see how we mounted ours. This is an option and the only thing I would recommend is to make sure you hit a stud and use strong lag bolts.
I took the smallest bit I could find and drilled across the wall till I knew exactly where the stud was. Remember that these are only 2x2's and not to use too long of a bolt! You dont want to pop out the fiberglass on the outside. I had to use an outside wall to find a good mounting point as most of the inside walls are just paneling and any size bolt will pull out causing a large hole and probably a broken Television.
Here is a link to the photo gallery of our 23" LCD and how we mounted it
Hope that helps. Make sure you check out the mounts you're going to use and I wouldnt recommend getting a inexpensive one. I think the mount I bought is a little over kill for how small the Plasma is, but so far in a few thousand miles of travel, it hasnt loosened a bit and the swivel capabilities are great.
One other thing, If we could have done it over, we would have lowered it a bit, as sitting on the couch or recliner, your neck cramps after looking up for the length of a full movie.
Oh Well, you live and learn!