I found this real nice template that I want for my website, but it has a .psd and I don't have photoshop, and cannot get it (free trial already expired). Is there any way I can edit this template?

http://www.gimp.org/

Paint.net should open PSD's as well I thought.

Not sure on Paint.net but gimp should work just fine.

Not sure on Paint.net but gimp should work just fine.

Gimp is a fine program. It should work with no problems, there are a lot of plugins and brushes which you can work out with to make it powerful as photoshop.

isn't there this addon for gimp that makes it look and feel a bit like photoshop?

Found it! -> http://www.gimpshop.com/