AntiTrust is cool. Others you may want to consider:
Hackers
Hackers 2
Pirates of Silicon Valley  (based on the real story of MS vs Apple)
Real Genius
Swordfish (not really techy, but has some nice tech in it)
Andromeda Strain (ditto)
Sneakers
Tron
War Games
Matrix


Here's some documentary-style tech shows. You may still be able to find them for rent or torrent.
Revolution OS
The Story of Computer Games
Hackers - Outlaws and Angels
In the Realm of Hackers
Triumph of the Nerds
Unauthorized Access