#1: Anti-Tank Movers - behave much like Tank Movers, except they're red instead of green, and only move Anti-Tanks.
#2: Missiles - these are fired by pressing Alt+Spacebar, Alt Gr+Spacebar, or Control+Spacebar, and are MUCH stronger than lasers. Missiles will destroy mirrors completely, kill Anti-Tanks from any direction (not just the front), and destroy Dead Anti-Tanks completely. However, you have a limited supply of missiles, and do not start with any - you have to drive over a Pack of Ten Missiles before you can shoot missiles. (The Pack of Ten Missiles object was implemented primarily to make it impossible to make shortcuts on older levels that predate the missile feature.)
If you have any other suggestions, please let me know.