The Complete Arcane feat Wandstrike states you can expend a charge of the wand to inflict damage, but also that "you can activate the wand as part of the attack." If you want to both inflict damage and get the wand's normal effect, does that drain two charges from the wand, or one?
It spends two charges
Wandstrike doesn't affect the cost of activating a wand, and it expends charges at its normal rate when activated during the course of a Wandstrike. A good rule of thumb is that if a feat doesn't say explicitly that it changes a rule or cost, then it doesn't.