Recommended add-ons/plugins for Microsoft Visual Studio

+1 Visual Assist.

It's unfortunate that you need a plugin to get really good intellisense but it's definitely worth paying for.

I've been using Visual Assist X for nearly two years now, and I find it so useful I can honestly say that if my employer didn't provide it, I'd have to pay for it myself.
I also use Cool Commands and SlickEdit (the free version), whose File Explorer and Command Spy tools are quite useful.

If you're doing C++ coding, hands down Visual Assist.

For the laptop bound or for those with vi/vim key bindings burned into the brain I would recommend ViEmu.

If you have not tried editing with vi key bindings here is why you may want to try "Why, oh WHY, do those #?@! nutheads use vi?"

Ghost Docs

GhostDoc is a free add-in for Visual Studio that automatically generates XML documentation comments for C#. Either by using existing documentation inherited from base classes or implemented interfaces, or by deducing comments from name and type of e.g. methods, properties or parameters.

Definitely Resharper.

Here is my list:

• Microsoft StyleCop (code analysis)
• JetBrains dotTrace (application profiling)
• Typemock Isolator (mocking in unit tests)
• Roland Weigelt's GhostDoc (code documentation)

CodePlotter and CodePlotter Remixed

It's not a Visual Studio add in, but it is a tool that I couldn't use Visual Studio without it...

ClipX - it's works with the normal clipboard, but saves the entries to a searchable list, you can use copy and paste as ususal, but you can hit CTRL+SHIFT+V and the list pops up. It works with images, text, etc. It even persists after you reboot your computer.