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Here's what I need help understanding:

I've got a vampire multiclassing rogue.  The multiclass rogue says "Once per encounter when you hit an enemy granting combat advantage with a light blade you can add (xd6) sneak attack damage to the attack."

With a vampire though, the powers have keyword : implement, shadow.  And the attacks are made with a ki-focus implement.  Does that mean that I cannot use the sneak attack feature with vampire powers?  Or is it legal to do as long as my vampire has a light blade equipped?

Kinda looking for a saving grace for a vampire XD

 You must use a light blade to make the attack in order to get Sneak Attack damage. If you're attacking with your ki focus you won't get SA damage.
(It's important to remember that a ki focus can either be used by itself to make Implement attacks or can be used on a weapon to make Weapon attacks with that weapon. So you can't ki-focus a weapon and then make an Implement attack with it.)
 Unless you somehow gain the ability to use a light blade as an implement, and use a light blade to attack rather than your ki focus, you're never going to be able to apply your SA damage any of your implement powers.

 

 Arcane Implement Proficiency... (If you weren't multiclassing rogue already, either the swordmage or sorceror mc feats would do it as well.)

 To be honest, though, I don't really think it's worth spending a feat to get sneak attack damage on an implement power once per encounter...
 You'd be better off just making a melee basic attack with a light blade - remember, you can get your sneak attack damage on an attack outside your turn as well so you may want to save it for when you make an opportunity attack or someone grants you a free basic melee attack.