Strong relationships are built on trust, but they can also be built on technology, and since you never really know what that girlfriend's up to, maybe it's time to spy on her computer.

PC Pandora is a keystroke logging program. Once installed on a computer, it silently monitors behavior and captures everything: passwords, e-mails, IMs and downloads, so you can feel safe. (And vaguely disgusted with yourself.)

And if you're on vacation (but you think she's cheating on you), don't worry: Data will be sent directly to your e-mail!

PC Pandora also offers 29 signs that your partner's cheating on you. Our favorite? "Your partner begins telling jokes uncharacteristic of them, or they start using catch phrases that are outside of their norm." Either they're cheating or they just started watching "Arrested Development."

This relationship saver is $50 to monitor one computer or $70 for two, in case you want to monitor your girlfriend AND your other girlfriend.