Recommended add-ons/plugins for Microsoft Visual Studio

SmartPaster - (FREE) Copy/Paste code generator for strings

AnkhSvn - (FREE) SVN Source Control Integration for VS.NET

VisualSVN Server - (FREE) Source Control

ReSharper - IDE enhancement that helps with refactoring and productivity

CodeRush - Code gen macros on steroids

Refactor - Code refactoring aid

CodeMaid (FREE) - Code cleanup, organization and complexity analysis

CodeSmith - Code Generator

GhostDoc - (FREE) Simple code commenting tool

DXCore (FREE) and its many awesome plugins: DxCore Community Plugins, CR_Documentor, CodeStyleEnforcer, RedGreen

TestDriven.Net - (FREE/PAY) Unit Testing Aid

Reflector - (PAY) Feature rich .Net Disassembler Reflector AddIn's

Web Deployment Projects - Provides additional functionality to build and deploy Web sites and Web applications (source).

StudioTools - (FREE) Navigation assistant, code metrics tool, incremental search, file explorer in visual studio and tear off editor windows. Moved from old site (archive.org) to new site and discontinued.

Not free, but ReSharper is definitely one recommendation.

Whole Tomato's Visual Assist X. I absolutely swear by it. I would like to see a better plug in for Lint than Visual Lint by Riverblade, but since that will eventually be moved onto the build server I don't mind running it every couple of days manually.