Healing Spells:

Comparison of Healing Spells by Class

Complete guide to each type of raid buff and which classes provide them:

Raid Buffs
Raid Debuffs

User Interface:
Raid Frame Showdown: Blizzard, Grid, VuhDo – Comparison and critique of three different raid frames.

Setting up your UI:
Part 1 – General UI Info
Part 2 – Action Bars
Part 3 – Unit Frames
Part 4 – Key Bindings
Part 5 – Combat Text and Notifications

Hunter UI – The UI I use on my hunter with descriptions of each addon and why I use them.