I've only seen one "effective" Resto/Enh combo...and actually the /enh part is pretty minimal.
I saw it from a some S5's out, 2200+ rating Sham. I was being nosy outside the Arena NPC's in Shat and my XPerl spied a interesting combo when I targeted him. 0/7/54 spec. Seemed odd at first glace, but its perfect for a Arena healer on the go!
Course, 7 points in Enh barely qualifies it to even mention the Enh part, as this is clearly Resto in make and practice.
0/40/21 Enh/Resto is pretty common, but either way you cut it, its gonna be heavy in either Resto OR Enh, not a 50/50 cut.
Only Class I've played that works "well" with a near 50/50 talent split would be a 31/30/0 or 31/27/3 Warrior. This does not work in the current talent tree's or the WotLK trees...which IMO "force" you to pretty much go a full 61 in a given tree to be "effective" in a spec. One could argue Blizz is making us specialize more soon. We'll see...
Edited, Aug 12th 2008 11:09am by gpyfb