I concur, the Orange Box is the greatest video game value I can remember. I really don't understand how they can sell it for so cheap and pay the development costs of three games.
Portal is worth the price alone. I'm curious if anyone here has been able to do the Portal challenges "Least Steps" on any of the rooms. On the second challenge room, for instance, I simply don't see how you can get it down to 10 steps when it takes about 7 or 8 to get in and out of the elevators.