I was looking at the site Visual Studio Gallery at what was available as plug-ins for the new VS2008. Here are some that I know are cool and others that looked rather promising:
PowerCommands for VS2008
This seems to be the most viewed one and it does add a lot of quick and easy commands to your right-click menus. Commands include quite a few include Open Containing Folder and Open Command Prompt. Nice one.
Source Code Outliner
Look at your code in a treeview to easily access methods, properties, etc. Nice navigation tool over your code.
GhostDoc - One of my favorite documentation tools that I have been using for many years. Right click on your methods and objects to document them quickly and easily.
WCF Load Test - From Microsoft - if you are working with WCF, you of course want to load test your methods. This looks easier than using ACT or something similar.
XSLT Profiler - NEW from Microsoft - The XML team has provided this tool to help you with your XSLT transformations. From them:
"XML Tools team has released the XSLT Profiler Addin for VS 2008 - a quick and reliable performance analysis profiler tool that assists in the development and debugging of XSLT documents. The XSLT Profiler Addin for VS 2008 allows developers to measure, evaluate, and target performance-related problems in XSLT code by creating detailed XSLT performance reports. The XSLT Profiler includes a wealth of useful hints for XSL and XSLT style sheet optimizations, which are essential for XSLT-based applications that demand maximum performance.
If you need to develop reliable and robust software, the XSLT Profiler is capable of detecting the performance errors and defects in coding so that they are corrected at an early stage in the development. This is essential in reducing the overall cost of developing software applications. The XSLT Profiler tool is fully integrated into Microsoft Visual Studio 2008 to provide a seamless and approachable user experience, combining several Microsoft technologies, including Microsoft XML Editor and XSLT Debugger, Visual Studio Team System, F1 (Performance Suites), and more. "
FSharp - Oh Yeah!
Ankh SVN Plugin - For those that don't like Tortoise and want something that reminds them of the old days of VSS.