Instead of using GIMP or Paint.net I wanted to help out fellow texture hackers (though I'm new to textures but not to photoshop)
Here is a link to photoshop cs4.
(PM for Link to download)
I haven't uploaded any textures *yet* but heres an example I did of my own custom peach using Photoshop.
When Photoshop CS4 starts up
just click cancel not accept.
That easy ^^
If you need any help or the download doesn't work for you let me know.
Also, Deviantart.com has tones of custom brushes that you can easily import into photoshop.
Hope you all have fun with PhotoshopCS4! I had CS3 and to me CS4 is sooo much better.
Enjoy