I recently went on a photoshop course and now I have to admit I'm addicted. I've been using photoshop for years but I'm pretty much self taught. This has led to some bad habits of doing things the long/ wrong way round!
However, I am now going to redeem myself by trying to learn as much as possible. I've got myself a great book and found pleanty of tutorials on line and so it is now my mission to learn as much as possible.
I've wanted to play with tilt shifting for a while now and it was a lot easier then I thought. Check out this tutorial here . I found it very easy to follow and I'm quite happy with my first attempt.
Here is the original for you to compare.