Phew, that's good to hear. Bad readings it is then, I'll use RealTemp from now on.
I can't say for sure where those readings are coming from. It seems to me that there are a few posts every so often with the same deal. Really the only temperature you should worry about pertaining to the CPU are the core temperatures (As is shown to you on a variety of those programs). You'd know it if you were hitting the CPU's thermal limit.