As i see, many people have been having some problems finding out how to specc, so i choose to make a topic, showing how i would specc a priest:
I've been playing a Spriest for 102 ingame days, and would recommend upcomming links as speccs
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PvE Specc [Shadow]:
http://www.wow-europe.com/en/info/basics/talents/priest/talents.html?0502300130000000000000000000000000000000000053250510050103051551
PvP specc [Shadow]
http://www.wow-europe.com/en/info/basics/talents/priest/talents.html?5040320100020000000000000000000000000000000050232510051100251551
PvE specc [Healing without spirit buff]
http://www.wow-europe.com/en/info/basics/talents/priest/talents.html?5002220130500000000000232051031300150531051000000000000000000000
PvE specc [Healign with Spirit buff]
http://www.wow-europe.com/en/info/basics/talents/priest/talents.html?5002220130500120000000232051031300150531030000000000000000000000
PvP specc [Healing]
http://www.wow-europe.com/en/info/basics/talents/priest/talents.html?5002220130425122031051203550200300000000000000000000000000000000
--- But to be honest, all should find their own unique specc, that makes you play a lot better, and then you would also know why you picked your talents. This is just my typicalls speccs, for whatever i am.
But thanks for you patient, and hope i helped :]