I have noticed in the app pages, two key apps have disappeared that need to come back in some manner: Games, and The RSS Page App page. This allows people to create many rss feeds or pull them to their network and you can go to the page and read the latest of news.
Also It would be great in the future if Ning App's would intergrate other more sociable apps to be implemented on peoples' ning like IMVU, DeviantArt.com, Secondlife.com, Vampirefreaks.com, Facebook.com and even Myspace.com widgets and apps.
That way you could pull your most interesting news from IMVU, Facebook, deviantart.com, even amazon.com to your network so people could see your astores, widgets and more.
Widgetbox has gotten kind of lame, many of the old widgets they have are now out of date, the blog's feed no longer pulls as its no longer in service.
Just FYI. It would also be great if Klout had analytics like Google does, for use on the ning network straight away into klout itself, as well as Google +
The apps on ning are horrible. :/