Might be old, but some of you might not know. Here it comes
On the PTR at the moment, there is a "little" bug with paladin healing. If you stack
Glyph of Lay on Hands,
Improved lay on hands (The talent),
The 4-piece set bonus of tier 3 (this bonus)
The Lay on Hands spell has MINUS ONE MINUTE cooldown! This means you can spam it all the time :P
Just for the fun of it!
EDIT: Damn, I just realised that if you check the PTR version of the 4-piece set bonus, they changed it to a 4 minute reduction of the cooldown.