The sims 3 limits are two fold:
1) Physical copies (DVD) have a disk check protection, thats it (that has been made aware of by EA, and no one has found anything else)
2) Digital copies (like from D2D/GamersGate/Steam) use SecuROM with a 3 PC activation limit. As long as you do not change your hardware or OS between installs you will not use up extra activations. If there is a chance you might have enough of a change to void the activation, you can de-authorize that computer right from The Sims 3 launcher (Click the Updates button, button to de-authorize should be on top).
Edit: NOTE - Be sure to de-authorize the computer before hardware/OS changes that could take up your activation. In the case of all of your activations being used up for whatever reason, you can contact EA to have a new one added (they might even recharge all 3)
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