Caution is healthy as long as it is based on facts. I heard that hot laptops are a breeding ground for Mexican Swine Flu?
I second what GB said - 66C is fine. What cpu do you have? The reason I ask is if you have a P4 with HyperThread you can turn that on and run both a uniprocessor cpu client and a gpu client at the same time.
Open the application. On the "Main" tab under "Target adapter" you should see your video card. Directly under your video card click the sideways arrow on the right side of "Customize...". Click the magnifying glass icon "Hardware monitoring". Some graphs will pop up showing clock speeds, core temp, fan speed, gpu usage, etc. Click the setup button on the lower right corner of the graphs window to add or remove graphs from the monitor. Move the sliders on the left to adjust to your systems monitoring range.
I hope that made sense.
That depends on your specific hardware. Some cpus are meant run hotter than others. What cpu and gpu do you have? As long as you stay within the temperature range running F@H on your laptop should be safe.