The Drow with sunglasses wouldn't be affected, their magic would still run down and the sun would still burn them.
Giving the Dwarves John Henry's Hammer
That's a normal hammer, no change is made.
giving a mage with a powerbook for spell book, and it can hack any spell in his repitoir.
Mage's limitations on spellcasting are due to their own ability, not knowing the spell (they can read any spell from a scroll but an apprentice trying to cast time stop will be lucky to be brain dead after it).
Giving the Dwarves a TANK!!
Hmm, the dwarves might be able to replicate it, since steam power is known as is black-powder (which is quite similiar to gunpowder), do you mean a WC style steam tank or a modern tank such as an Abrahams? (Whose computer tech the dwarves could not replicate nor could they keep it supplied).
giving the bard a song book of Jethro Tull, Eric Clapton, and Led Zepplin
+1 to perform checks, and a few more CN villagers roam the lands
.
Dropping Ash into the Dales.
Do you mean covering all of the dales in ash, thus destroying their crops?
That would make quite a difference since it would quite possibly casue a famine, especially after the damage caused by the Shades caused flooding and crops destroyed by dragons under the rage.
It might even weaken them enough for the Zent's to attempt another invasion or for some of the more militaristic groups (Battledale, featherdale) to annex some of the smaller dales that are focused on crop exports.
giving gnomes swiss army knives
They throw it away, far too useless. If you had said a Dragonlance kender on the other hand
.
Also, are you on drugs again? This is a rather peculiar topic