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Problem IV: Comparisons Should not be done between separate end-users
I believe, that with the inaccuracies of socket-thermistor temp measurements, that they should solely be used as an "approximation" for any single user. Comparing temps between different systems and case setups is hardly feasable, as temps compared on a single motherboard are already impossible to do(with socket-thermistors). One thing you can do is to go to my solutions page and approximate your own cpu temp, and try to figure out how "inaccurate" the thermistor is for your particular temperature/voltage/overclock(it changes for each overclock, due to compression of temp changes).
Problem V: High Rate of Instances where the temp measured is highly inaccurate
There are instances of 10C or even greater accuracy errors. For instance, in the Anandtech "Comparison", there is a 12C accuracy error on the C-orb. For an error of over 23%. On the UL bios, as well, so even though the newer, compensated BIOS' do a good job approximating temp, they are still approximating, and are subject to potential huge reading problems. Then, in this recent Anandtech BBS thread, there is a user that is reading a 30C CPU temp, with a 23C system temp on a KT7. This is probably an error from actual core temp of almost 17C, for an error of ~43%.
Results like these are not abnormal for socket-thermistor setups. Unfortunately, they can be extremely common. Sometimes the temp "error" is 5-6C, other times its 10C, and sometimes 15C. The problem is that there is no way to predict how "off" the thermistor reading will be on a wide-case basis. It has been done on an individual basis.