The shaman Theorycraft Thinktank resources have been moved to the discussion threads. Read the appropriate thread OP for a great comprehensive guide to your class. If you're just looking for a quick answer, or a link to get you started, you'll find what you're looking for right here.

Elemental

A sample talent spec: MMO-Champion / Wowhead

The elemental shaman guide includes guidelines for what stats you want on your gear, how to reforge, and what spells you should cast. Everything is up to date for patch 4.3, including tier set bonus information and a significant change to aoe rotation.

Enhancement

A sample talent spec: MMO-Champion / Wowhead

The enhancement shaman guide includes information and analysis on talents, stat preferences, reforging and gemming, play style, and everything else you need to know. The guide has been updated and moved to a new discussion thread for patch 4.3. Pay special attention to the aoe and caster weapon sections.

Restoration

A sample talent spec: MMO-Champion / Wowhead

The resto shaman guide is a comprehensive source with in depth information about talents, glyphs, stats, spells, and more. It includes an update for 4.3 changes, and it has notes for all the ways that you can adjust your spec or play style to your raid's needs.

General Interest

This is the Professions section from the moonkin guide. Replace intellect with agility for enhancement.