Visual Studio must haves ...

Some shown by Robert green in visual studio toolbox on channel 9

Extensions
All in one code browser

code metrics viewer

indent guides

power commands for vs 2010

productivity power tools

snipped designer

spell checker

vs10x code map v2

vs10x method block highlighter

vscoloroutput

web essentials

web standards update

css essentials

devart code compare

dpack

perf watson

jscript editor extensions

js parser

js enhancements

Image optimizer 

 

Tools

code rush express

dotpeek