Mac users, note that CS2 isn't a universal-binary build and requires a PowerPC or Rosetta, so this won't work directly on versions of OS X beyond Snow Leopard. The Windows version will run fine using VMWare, VirtualBox, or Parallels, however.
Quoth Forbes:
If you have a digital creative streak but your budget doesn’t extend far enough to buy Adobe’s Creative Suite applications, this is for you. Adobe have made available an array of applications from its Creative Suite 2 bundle — for free.
Along with the ever-popular Photoshop CS2 are applications such as Premiere Pro CS2, InDesign CS2, and Illustrator CS2. If you want the whole bundle, the entire Creative Suite 2 is also available for download.
CS2 is not new by any standards — it was first released in April 2005 — but it’s still a fantastic offer and capable of some serious work. And when the cost is just the time it takes to download it, it’s a real bargain.
Download Adobe Creative Suite CS2 from Adobe
Note that the download area is currently being slammed this morning (Mon, Jan. 7) since this was just made available, so you may get a "We're sorry, the site area you've requested is unavailable. Please try again later." message.