If you are a ReSharper fan like I am you need to know that v4.1 has just be released. This version has a huge list of improvements, the main one are support for VS 2008 SP1, Better ASP.NET support, Performance improvements, and a ton of stability improvements and bug-fixes. Read the 4.1 release notes to see all the goodness in this release. If you are new to ReSharper check out the feature map to see what you are missing.