Adobe is giving CS2 away fro free from their website. Including Serial Numbers - but no support. It works even on Windows 7 and current Mac OSX - but you have to fiddel around a bit.
But still - Photoshop CS2 and the Professional Acrobat etc. is worth it.
http://www.adobe.com/cfusion/entitlement/index.cfm?loc=en&e=cs2_downloads
Update: You might only use this versions if you have a valid license.
