http://gizmodo.com/5973730/grab-photoshop-and-cs2-for-absolutely-free-right-here
The Mac version, incidentally, is for PowerPC chipsets, not Intel.
Update sorry, someone messed up at Adobe, this turns out to be untrue, see:
http://www.diyphotography.net/download-adobe-cs2-for-free
for the true story
And another update It's back on line, nobody seems to know what's going on, but I'm just installing Acrobat 8 for mac and it seems to be OK - I'm a legit user of the PC version so I won't feel guilty about this if it turns out to be another error. See
http://www.adobe.com/downloads/cs2_downloads/index.html