I am an avid reader of many tech blogs, one of them being gizmodo.com.
They announced today that it looks like Adobe is "... tired of keeping the activation servers running to support legitimate installs of the 10-year-old CS2, so it's decided to just give it away." - Gizmodo.com
So if you create an account on the Adobe site you can download Photoshop CS2 or the entire Creative Suite for free now.
Since this news was released the Adobe servers are being overworked, so be patient or try later.
"Update:The install for Mac is actually for Power PC devices, so you'll need Mac OS X v.10.2.8–v.10.3.8 or Rosetta to get it working." - Gizmodo.com
PC users are fine.
Hope this helps a few people.
Link: Adobe Downloads
:: I believe you'll need to create an account if you do not have one already.
Make sure you copy the serial number down!!