Found this little gem a few days ago. It's a simple strategy game where you take on the role of an AI that's achieved sentience. You have to subvert computers to increase your power, earn money and conduct research to improve yourself. The tricky part is staying hidden, since if you're discovered, you will be destroyed.
It's pretty basic, but it's a heck of a lot of fun, so I thought I'd share it with you all.
http://www.emhsoft.com/singularity/