The november ctp release of Enterprise Library has just been made available for download on gotdotnet!
Tom Hollander on this release "[...] we're very close to complete. We're confident that this build is high enough quality for you to commence development with, although since the final release is scheduled in December we definitely recommend moving to it as soon as it is available."
Unfortunately this release doesn't contain the configuration tool, which will be available in the final release.
The final release is planned for December and this might be the last CTP to give feedback on.