I just ran over a site which shows some of the cool new features in Adobe CS2 in short videos. The two best improvments (to Photoshop) are , in my opinion, is the Vanishing point tool, and the WYSIWYG Font menu. Really cool!
Check it out : http://www.photoshopuser.com/photoshopcs2.html
(Adobe® Photoshop® CS2 is released in May 2005)