Arduino Regulator: How hot is too hot?

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when ever run arduino uno r2 + ethernet shield web server more few minutes, notice both regulators become hot. noticed regulator on arduino operates hotter.

the regulator on ethernet shield levels out @ around 106f (41c), while regulator on arduino tops off @ 146f (63c), untouchable.
i'm supplying steady 9v , nothing fancy attached setup, ethernet shield's wiznet chip , few status , data leds.

if can provide info on whether or not normal, great. little web server may set long-term thing , i'd last.

in advance, thanks

what checking datasheet of mentioned regulators , see normal temperatures ( , without heatsink?!?)
that way start getting used reading datasheet.


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