Alright, for anybody who'd rather use the trusty CS4 than the newer version of Photoshop Creative Suite; CS5, then here's the download that will get you CS4 for free. No torrents, no serials, just a straight up download, and the only thing modified is the loading screen for the program itself.
Download Link: http://www.mediafire.com/?jc5mfjz1k3n
Instructions: Once downloaded, extract to anywhere on your computer (I extracted to Desktop). Then, click on the nuke-ish looking icon (it's the installation program), and go through all the steps. Then, if you have Windows 7+ or Vista, right click on the Ps icon and click Run as Administrator. Then, you will have to accept some terms, and your Adobe Photoshop CS4 will start right up!
NOTE: This is the Portable version of Photoshop, and this may or may not be illegal. Download at your own risk.