Assuming you are using Realtemp3:
First Row: Processor type, current freq, unrated FSB x multiplier
Second Row: Temp °C. This is the thermal junction temp(s) of each of your processor core(s)
Third Row: Distance to Tj Max. This is how much hotter each processor core can get before it's at it's design limit.
Forth & Fifth Rows: The minimum and maximum temps recorded for each of the processor cores since realtemp was opened, and the time at which it happened.
Sixth Row: Thermal Status. Fairly self explanatory...
Max temps are highly specific to what processor you have. Normal temps depend on processor, case and operating environment. Feel free to feedback more info....
If you want more detail on anything post back.