Detailed installation instructions for the webapplication can be found in the Instructions directories of the installation files. There is an extensive ReadMe.txt file explaining the setup and installation of both a new install or upgrades.
An overview of installation instructions (both old and new SP versions) can also be found at http://survey.codeplex.com.
Great news for the Survey Project webapplication!
As of today (4th Aug. 2011) the Survey tool has been added to the Windows Web App Gallery at:
You can download and automatically install the Survey tool from this Microsoft website.
Any additional software you may need to run the Survey application (like IIS, Sqlserver, .NET 4) will be checked for and offered for installation during the process.
The Survey tool can also be found as one of the available applications through the Web Platform Installer 3.0.
The WPI is both available as a standalone application and as part of the IIS Manager.