my mrs knows all my passwords and i don't know any of hers

but i don't give a shit because i have a fairly good idea as to what she gets up to (normally shopping online or talking to her family on msn)

on the other hand, she knows more about computers than i do so she might have hidden soemthing away

where do i get one of these key loggers from? i want to make sure she'snot talking shit about me behind my back or spying on me when i go into the mens room