Another little tidbit I just played with, MoP itself has a recharge time of 45 seconds, which is NOT brought down to 10 when it is recharging, but IS increased to 10 when it is ready to cast. Yeah, I know, sounds weird, but if you get a mesmer secondary and use Arcane Echo, you can cast Echo, then cast MoP. This replaces your Echo with another MoP, which takes 10 seconds before you can use it. When you do use it, the original MoP does NOT get reset to 10 seconds (ie you still need to wait the rest of the 45 second timer out). By the time your original MoP is able to be used again Echo has worn out. This does, however, let you cast two Marks of Protection
Oh, and Arcane Echo is unlinked so you don't have to allocate any attribute points to it in order for it to be effective!