Adobe isn't publicizing this, but if you're a registered owner of Adobe Photoshop CS2 or CS3 and want to change platforms, they'll give you a free, one-time cross-platform upgrade. If you surrender your old registration number, they will ship you the full version of the other platform for free. All you pay is shipping.
Also under-appreciated is that there's a way to defeat the DRM (digital rights management, also known as copy protection) for Apple iTunes songs. Simply copy the songs to a CD-R and then reload-them on to your hard drive from the CD you made. The DRM won't go along for the ride.
Mike (Thanks to Christopher Lane and John Atkinson)