T500 overheating problems - Novice needs help

Like for some others in this forum, my Thinkpad T500 is overheating.
Here are my specs:
Model: T500 (Type: 2055)
Processor: P8600 (2.40GHz)
GPU: ATI Mobility Radeon HD 3650
When I'm doing most regular activities (browsing,emailing, documents), laptop is fine. The unit gets warm underneath, but I've not had problems.
If I'm doing more intensive activities (watching local video,Netflix, or Skyping), laptop starts to heat up enough so that it's uncomfortable on my lap.
When I play games (Nothing crazy intensive: e.g. Minecraft, Civilization 4), and sometimes when I Skype, the unit gets extremely hot underneath and shuts off without warning.
The heat seems to be originating from the left-hand side of the laptop, near the back. Unless I'm mistaken, this is where the GPU is located. And this makes sense, since the overheating seems to be related to graphics-intensive activities.
So, my questions are:
1. How can I diagnose this problem further? What's a good utility to use to monitor heat of GPU and CPU? Anything else I can use ?
2. Are there any settings I can change on my laptop to prevent the automatic shut-downs and excessive heat?
3. I've seen some mention of people cleaning fans, replacing fans / cooling units, or adding thermal paste. Need some advice there too.
Any suggestions are welcome.
Thank you!

Good day and welcome to the community.
If you've never had the machine open to blow out dust from around the fan/heatsink assembly, I'd recommend that first. If you download a copy of your Hardware Manual: http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/43y6630_04.pdf , you'll see that by pulling the palmrest, keyboard and keyboard bezel (manual pages 88-90, 92-93 and 102-103, respectively), that you'll expose the top side of the assembly in the upper left. The top view image on page 107 is helpful. The CPU is beneath the end section of the wider heatpipe and the GPU is beneath the narrower.
While holding the blades of the fan stationary (important!), you can use canned air to blow all of the dust from the inside out through the exhaust vents. Once done, button everything up and see if things run cooler. If you're still overheating, you may need to clean off the old thermal compound and apply new, but try the de-dusting first.
Regarding temp monitoring, many folks like TPFanControl: http://www.staff.uni-marburg.de/~schmitzr/donate.html
Scroll about 2/3 down the page for the download link for v0.62 which is the latest. It can be run in monitor-only mode or can be configured to provide a level of control over your fan speed.
Please post back your results from the first step and we can go from there.
Regards.
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