If you're about to release a new module and have some beta testers, it's probably a good idea to release a developer only version first and then switch it to a final version number after your beta testers (that includes you :) ) are happy with it.
To do that, simply appends the release candidate number at the end of your version number. To release the first dev RC version of version 0.07, simply do:
our $VERSION = '0.07_01';
In your main package.
The CPAN will detect it and make your release a dev release only.