For Shadow PvE, I'm using
http://www.wowhead.com/?talent#bVcbhZZGxfVRfzcfqfzAo which is probably the same as any other spriest out there right now, we just don't have any spare talent points really. Imp. Shadowform is a "maybe", but with all the AoE in raids, the pushback protection is huge.
My alt spec is Disc PvP, and I'm using
http://www.wowhead.com/?talent#bxIbhhGiRIsfbRtfVz:oTbzVThere's a few alternatives I've been considering, like dropping Imp. Flash Heal for Martyrdom and 1 point in Blessed Recovery. For more pressure and less survival, you can drop 5/5 Spell Warding for Divine Fury. I basically find myself never casting GHeal, as Flash Heal + Penance are so much stronger. Plus, I never really have time in PvP. In Arena, I'll usually pop PW:S then use the haste from Borrowed Time to snap off a quick Penance, then Flash if necessary. The other alternative is dropping Imp. Flash Heal for Divine Aegis if your crit is respectably high. Right now, I personally don't feel it's quite enough. If I were to do that, I'd also drop Imp. Renew for 3/5 Holy Specialization for the extra base crit. Mostly I'm happy with it, as I've been facing more casters and DKs/Ret Paladins in Arena, and considering how much of their damage is considered magic, the 5% reduction from Spell Warding is worth it. If I were hitting higher rating levels, I'd definitely take Divine Fury, and drop Imp. Flash Heal for Divine Aegis and Imp. Renew for more crit. I'd even consider dropping Mental Agility for Absolution if more and more magic DoT classes were showing up.