Tj Max is the temp where the CPU will start to throttle, realistically you will want to stay much lower then that, the recommended max temp for the cores is 62 degrees.
Really low idle temps like that are usual for an AMD CPU.
So, the core temp program is showing each cores temp in a little tray icon. Do I add all the cores temperatures up for the total CPU temperature or is there a nice neat program for reading my CPU temperature?
Also what defines CPU temperature? - Kinda like what I asked above. Do I add up the core temps or what?