Say you have a dating or a business website. Perhaps you want to host a question and answer meet. You have a widget that allows people to set their availability on the site or via their profile and it is also on a widget. You can also arrange this around a host's chat or what not or if you have a tarot reading site and you want to let people know you are online for readings.
Another idea is similar to facebook groups with the author tags, author badges, groups or admins can set who starts good conversations or who posts amazing photos and content.
Member Counts - number of articles a member has written beside their user name, updates whenever the member posts something new.
Birthday and other reasons TipJar - on twitter and other media now they have something called a tipjar. Add or send money to someone for their birthday, anv. or say tarot readings or what not similar to twitter that works with the e commerce area, that individual users can use via ning or a ning network.
Ning Store module. Adds a store to ning similar like user catalog or craigslist where people with stores can have a store and a community surrounding it. Allow paypal also as a gateway payment, as many online stores won't allow paypal.
Groups Sunset or Archived notice - if a group has not been used lately a period of X days can be set in the admin panel, and if set and it passes, a notice on group says "archived or not active" and goes into only read mode. Admins and creators of group has access too turn it off but not delete it, or delete it if it appears too spammy or against content rules.
Tags Cloud widget - posts a tags collection of the tags on the network like "ning, tips, tricks, ideas" which is searchable in search only. Clicking on a tag brings up a list of those pages associated with the content which could be a work around for #hashtags in the news or site feed.
This seems to be a better "top content module" than that of the leaderboard, which wastes space on ning networks.