29 Oct 2008 at 20:10 - 4
I seem to reading something on this, might've been a guild guide or something, but it actually does benefit to ID things.
IDing whites increases the sell value of the item; and, as long as it is a normal area (that means max weps, or near that - not the cheap Ascalon stuff) it'll gain more value than the cost of the ID kit.
But don't take my word for it, ID kits are 4-5 gold per ID, then check the value of your white items before/after ID. You'll find increases of 20-40g+, much worth the time to ID things.
(An ID is 4/item with a normal ID kit, but 5/item with a Superior - if you want to ID everything, start buying the normal ID kits more so.)
-Magical Samurai
EDIT: Oh, salvaging - no, don't think IDing makes a difference.