Visual Studio provides a rich extensibility model that developers at Microsoft and in the community have taken advantage of to provide a host of quality add-ins. Some add-ins contribute significant how-did-I-live-without-this functionality, while others just help you automate that small redundant task you constantly find yourself performing.
This article provides some of the best Visual Studio add-ins available today that can be downloaded for free. (Click on the links to explore them !!!)
Smart Paster (http://weblogs.asp.net/alex_papadimoulis/category/5341.aspx)
VSWindowManager PowerToy (http://workspaces.gotdotnet.com/vswindowmanager)
Cache Visualizer (http://blog.bretts.net)
There are also a lot of add-ins that can be purchased for a reasonable price(Though, I never bought one …) for some better options, as in some cases they can add some tremendous functionality to the IDE..
Happy Coding !!!
Note: GotDotnet Site is closed. Instead Microsoft has come up with MSDN Code Gallery. You can visit the site at http://code.msdn.microsoft.com/