A who's online widget
Chat notif: "so and so says" and makes tab blink
RSS needs. Ning recently teamed up with Zapier. I think something like this or even Feedly could help hiveflare as well..
However most zaps created for ning are dumb and you need a zapier account premium to be able to use them.
New layouts (page) and Themes (Music/Dating/Mini/Job board/Pin board etc) would be interesting.
Ability for me to add in my own layouts for pages similar to spruz layout drag and drop.