From this page you can download the EAP builds for ReSharper 2.5. If you are looking for the latest released version, visit ReSharper download page.
ReSharper 2.5 (Roadmap)
ReSharper 2.5 is released! You can go and download the RTM build here.
ReSharper 2.0.3 (Changes)
ReSharper UnitRun 1.0 — Build 1 (Changes)