Does this title come as a surprise to you? But, yes ! computer can help you with some additional things too (apart from computing).
With a small program, you can make the cradle (baby rocker) of your baby swing, without your presence. Shocked? Well, do you recognize you PC has a CDROM and also a program can also open & close a CDROM drive? Continuous opening & closing of CDROM can help in your baby rocker’s harmonic motion.
Check this link for similar innovative ideas: http://blog.makezine.com/archive/2009/08/linux_baby_rocker.html