Kernel SMC::smcReadKeyAction error I just looked in the OS X Console, and noticed that there's a huge number of errors looking like this:

6/12/12 8:33:16.000 PM kernel: SMC::smcReadKeyAction ERROR F1Mn kSMCBadArgumentError(0x89) fKeyHashTable=0x0xffffff800a715000


There's one almost exactly every 5 seconds. Any ideas?
Are you on OS X 10.7.4 ?
Then an explanation and possible solution might be found here on CNet:   

Tackling SMC console errors after OS X 10.7.4 update

"Might", because it didn't work for me - even after uninstalling iStat Menus v2.x, so it must be some other application(s) on my part that is causing this...