When the Storm was released, I was was lucky to get one that did not have screen clicking problems. I couldn't fathom what people were talking about until I had an issue with my storm and had it replaced. The replacement, I immediately sent back. The second replacement was better but not perfect. I did not want to keep sending them back in hopes of getting the perfect one again.
Anyway, I loosened the screws and that seemed to have solved my problem. The click action felt a bit loose though so I went in search for something else that could be a better fix. I lurked in another Blackberry Forum and stumbled upon a post by "dmcman73" and a revision to that post by "TBacker". I went with the solution proposed by TBacker. Pics of the screen click mechanism - BlackBerry Forums at CrackBerry.com
I tightened up the screws in my Storm and started with two pieces of electrical tape. The click action was much better and didn't feel loose. I added a third piece of tape and I believe it is almost perfect. It feels better than the original Storm that I had. I do not think I could fit a fourth piece of tape in there without bending the battery door. My Storm feels much more solid when holding it. Here is the picture that TBacker posted.