Hypersmurf
Moderatarrrrh...
You still cannot activate a wand unless its in your spell list. Unless your a bard or rogue using use magic device.
What's your point? Moon Blade is on the spell list of clerics with the Moon Domain, and the wand removes the "limited domain slots" problem.
Now, Since, you cannot be under the effects of the same spell at the same time. This limits the ability to use two of these spells entirely.
I'm afraid you're wrong in this case, since Flame Blade is not "Target: You" but "Effect: Swordlike Beam".
You're not under the effects of any spells. It's like saying "You can't use Summon Monster III a second time if the first one hasn't expired!"
Nothing in the rules prevents you casting Flame Blade twice and producing two Swordlike Beams.
-Hyp.