found this tutorial - I just glanced through it - hope it is helpful.
I glanced through it also -- seems OK. You might also want to look at the DPC Tutorials on Layer Masks (if you're not familiar with saving/modifying selections) and on making "Fake Miniatures" -- it simulates a slightly different form of shallow DOF look, when your subject is situated part-way back into the scene, and you have both fore- and background elements to modify. Applied "less aggressively" than in the tutorial should give a relatively natural looking shallow DOF effect.
Yup. I'm using it more often lately and it works really well, I just wish the interface would be smoothed out more for more options when creating the selection. Like being able to bend it.
Gaussian blur with a series of feathered selections. It's tricky.
I find using featured selections makes it tricky so I avoid them. Well except when making the blur fade from foreground to background but that's like the last step. The rest is sharp masks and little touchups to make the blur flush with the sharp edges.