I recommend that that you create a turnkey application that uses your
mylibrary framework and bundle it separately. Another possibility
would be to write little how to articles that show how your framework
can be used in a bite sized project.

It might be beneficial to look at some content management systems like
drupal [1] or blogging tools [2,3] to see how they are leveraging both
a turnkey application and a hacking framework at the same time.
Looking at how popular web application frameworks [4,5] are marketing
themselves could also help too.

I think that one thing that these projects show is that the success of
a particular framework is largely dependent on marketing acumen...not
something that comes naturally too humble library hackers.

//Ed

[1] http://drupal.org
[2] http://wordpress.org
[3] http://www.sixapart.com/movabletype/
[3] http://rubyonrails.org
[4] http://www.djangoproject.com/