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Goblin Quest (original 2004; edition 2006)
by Jim C. Hines
References to this work on external resources.
Wikipedia in English (1)
Amazon.com Product Description (ISBN 0756404002, Mass Market Paperback)
Jig is a scrawny little nearsighted goblin-a runt even among his puny species. Captured by a party of adventurers searching for a magical artifact, and forced to guide them, Jig encounters every peril ever faced on a fantasy quest.
(retrieved from Amazon Mon, 30 Sep 2013 13:23:35 -0400)
Tormented by bullies, lowly goblin Jig, along with his cowardly fire-spider, is kidnapped by a group of adventurers and forced to lead them to the Rod of Creation, a dangerous mission that pits him against a Necromancer and a Dragon.
(summary from another edition)