We're excited to let you know that we've rolled out a public-facing version of the Ning Apps directory, complete with permalinks that can be used to promote Ning Apps directly to prospective Network Creators. It's available here:
Here's how to grab a permalink:
1) Click on the logo of a Ning App in the public directory
to visit your Ning App's description page.
2) Copy the description page's URL.
You can then spread your permalink to Network Creators as you see fit (Twitter, Facebook, blogs, etc.). When a prospective Network Creator clicks the "Add to My Network" link on your permalink page, they'll enter their Ning Network's URL, then be bounced directly to your app's install page on their network.
Please let us know if you have any questions!