Very nice job on this tutorial. Looks a lot like real rain. And I like the image you used for the example; fits the rain perfectly. Overall, I give your tutorial a 9/10.
I also would like to make a minor correction about your tut... On Step 7, you have listed to go to "Effects > Blue > Motion Blur," but, to my knowledge, there is no "Blue" sub-section.
I figured out that you meant Blur pretty darn quick, but some.... "Beginners" might not; since you are aiming towards a more user-friendly/beginner-friendly tutorial.
Good Job, though. 8)