Adobe has released Photoshop CS2 for free.
It may not be the newest version.
It may not be the best version.
But it's free.
Which is a heck of a lot better than paying $600+ for a newer version.
You can get it on their website here: [link] You do have to make an account if you don't already have one, but that's pretty easy. Then you're at the downloads page and you can find Photoshop a bit of the way down. On the right is the serial number for when you're installing it.
I just wanted to let you guys know, in case you draw digitally or want to, but can't afford a newer Photoshop program or SAI.