Though there are cheaper ways of using technology to spy on those close to you, if communication and honesty seem to have broken down, the Keylogger keyboard could be just what you need.
This is no mass-produced system, either. It's a one-off keyboard from the Spy Warehouse.
It features 2MB of storage, enough to log two million keystrokes. If that's not enough to capture a few days' worth of banking passwords, IM conversations, and web surfing habits, then your relationship with the person you're spying on has really serious issues.
It's a standard Microsoft Natural Keyboard, but with the keylogger built in, and is currently selling for £215.
Product page (via SciFi.com)
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Great device. I own one device like this and also with built in transmitter and another design. It works well for years.