I only use ASUS (I used to work as an account manager for the *then* exclusive distributor of ASUS boards in Canada), so I wouldn't know/care about anything else...
But I do know that there are other boards out there that will read the diode. If yours doesn't, then you can still make a circuit that will (with some extra fine soldering).
There is some controversy about the ASUS, because its reading of the temp (wether it's built-on or in the CPU) seems to be a little erratic, but the Asus boards now include OCP (Overheat Circuit/CPU Protection), and will shut down the computer if it gets too hot. The thing is, this system has some peculiarities that you need to be aware of. Look for A7V333 reviews.
All in all, most boards have a way of measuring temp. Wether its from an on-board circuit with its own thermal probe, or through the CPU's diode. Most times, you can access that info via software as well.
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