Adobe's CS2 licence server went kaput, the licenced guys were not happy as they could not get back ups. Adobe, made CS2 available, but as the Licence server went kaput, they could not tell if the downloader was legitimate or not. In any case they have made the whole suite available to all.
No registration required.
All serials provided.
Link:
(Link removed by Chromium)
Edit:
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UPDATE from Kevin Monahan, Sr. Content and Community Lead for Adobe After Effects and Premiere Pro:
“Effective December 13, Adobe disabled the activation server for CS2 products and Acrobat 7 because of a technical glitch. These products were released over 7 years ago and do not run on many modern operating systems. But to ensure that any customers activating those old versions can continue to use their software, we issued a serial number directly to those customers. While this might be interpreted as Adobe giving away software for free, we did it to help our customers.”
Edit: 07/07/2013
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Seeing something on site here at PF, I revisited the link. It is now not the free to download software it appeared as initially link removed.