Some are more like 90% off... Vista Ultimate was $35, retail is $300+ last I saw..
You can even get deals on XBOX 360 titles... Halo 3 on release day for 20$ yes please

Apple employees have it well off too, 25% off on hardware (but even so the RAM is too expensive), similar deals on Apple branded software.

What I *really* need to find is someone who works for Adobe, and find out how much of a discount they get... there's a few hundred people working for them here in Seattle and I somehow have none of them in my circle of friends... need to work on that I guess.