From this page you can download the EAP builds for ReSharper. If you are looking for the latest released version, visit ReSharper download page.
ReSharper 3.1 is released. ReSharper 4 EAP will start soon, before that we are going to start publishing nighly builds for our very loyal early adopters
Read installation instructions to learn how to install ReSharper for Visual Studio Orcas