You can get Afterburner & Rivatuner on guru3d.com. Rivatuner offers a customizable on screen display that includes cpu/gpu temp and just about anything else you want to know. The color of the OSD is customizable and can be toggled on and off on the fly, and it can even take screen shots in games without the option to do so. This seems to be a nice setup guide: http://www.overclock.net/a/how-to-use-rivatuner-afterburner-on-screen-display-and-more
I always play in windowed mode. Like anything new, it is very noticeable at first. Guys tend to be less observant when they become husbands and that gets us in trouble... and depending on what it is we don't notice, there are varying levels of pain to be experienced
"Hey honey ... It's been a week now, how come you haven't noticed my new [inset something here] ?