There is a regular psd file only with the background.
I have Photoshop CS 5.1, ran into a problem: I do not know how to cut out the background or the background to be two main background was such a stretch greens here at 100%, while the other (which is at the center of the white glow) was like in the center of the future site. I was just trying not to cut. Either cut out the curve, or the background is not inserted.
In short it is necessary that the central part of the site was a white shadow:)
Sorry for bad english
First of all, I think that it’s not a good idea to use a software who is designed for digital photograph post-production, when you are trying to illustrate something. I strongly recommend Illustrator or Inkscape instead of photoshop wich I think is great for other purposes.
This article could be useful to achive the gradien to transparent effect in illustrator.
http://creativetechs.com/tipsblog/transparent-gradients-in-illustrator/
Are you trying to do something like what I sketched out in this fiddle?:
http://jsfiddle.net/2vvz3/
If not, let me know where’s the diference and mayebe I could help you out with this problem.