[Forrest]

Ah, interesting.

The Photoshop CS3 license agreement states:
2.4 Portable or Home Computer Use. The primary user of the Computer on which the Software is installed may install a second copy of the Software for his or her exclusive use on either a portable Computer or a Computer located at his or her home, provided the Software on the portable or home Computer is not used at the same time as the Software on the primary Computer.

(Section 2.5 is only about volume licensing.)

So I'm going by what the actual license agreement says. It says "use" whereas the FAQ says "run."

Also, I've always been able to run the apps on two machines at the same time. I currently have CS3 Design Premium installed.