Some projects require distributing large files, such as binaries or installers, in addition to distributing source code. There are several low cost services that are optimized for bulk storage and distributing large files.
Amazon has a great guide on Getting started with S3 that goes through the process of creating a bucket and uploading files.
If you're using Windows, S3 Browser is a great free app to upload and manage your S3 files.
Once you've uploaded a file, you can insert the link to the file into your
README or even into the repository description.