Well... I'm not sure if i'm reading it correctly, but before a, say, a dagger is thrown, it *is* considered a melee weapon.
I add 2 "imbuers" and 1 question to the pot: does imbuing, via the Spellsword ability or the Arcane Strike feat, and throwing the weapon afterwards discharge the spell on the target?
I know the Duskblade ability doesn't work this way, 'cause it needs a melee attack to deliver the spell, but these other two i mention, only specify that the target has to be a melee weapon. One could always throw an imbued longsword by taking the -4 penalty to attack, right?