Now you can download previous version of Adobe’s product such as Photoshop, Creative Suite, Video editing software Premiere Pro and much more for FREE (legally)
Both Mac and Windows version of the softwares are available. You can see the list of products available along with the license key.
If you hate downloading large file directly through browser (like me), download the software from torrent site and use the license key available on Adobe site.
License & Download link : http://www.adobe.com/downloads/cs2_downloads/index.html