A guildmate recently asked me to recommend some addons, so I'm using this post to provide links. Some of these I've previously highlighted on my blog, in which case the link goes to the blog post first and is noted with a star *. Other links are to the preferred source for that addon to the best of my knowledge.

First, my own:

• ALE (Another Laggy Evening) *: My fancy ping meter.
• GuildBB: In-game forums system that sends messages via the mailbox.

Addons I recommend:

• Bartender3: Easy to use and configure Button Bar replacement.
• CT_MailMod: Send multiple attached mails easily.
• ItemRack: Switch gear sets very quickly. An addon to do this is almost essential when you have multiple sets of gear.
• LinkWrangler *: Open more than one linked item at a time.
• OmniCC: Display cooldowns on everything as a countdown number.
• PhanxChat *: Chat channel changes that are more logical than Blizzard's defaults.
• Pitbull *: Great feature-rich UnitFrames. Warning: very complex to setup.
• Quartz *: An excellent replacement Casting Bar.
• SCT (Scrolling Combat Text): Much better than Blizzard's copycat Floating Combat Text.
• SuperInspect: Inspect from futher away and cache it too.
• SW Stats: DPS meters.
• TrinketMenu: Switch and use trinkets easily, with auto-queues for cooldowns.
• XPUpdate: Display exp as numbers instead of a bar.