I have uploaded a pre-release of ReiserDriver. It is available under the 'Releases' section as 'RFSD Pre-release v1.' Make sure you read the release notes to know what to expect.
That said, a more thoroughly tested version (which should also support large directories!) will be released within the next few days. Progress is very good, and the project is nearing completion.
Stay tuned for the August 9th final release.