The post itself (billed as "the one you need to read today") was exceedingly thin and mostly gobbledygook but there you go. A link to http://knappsack.com/ is worth attention.
If it gets around the problems of sharing iOS apps while under development then I am keen. (thinking about it some Android devices can be tricky to get dev code onto as well).
The idea is Knappsack enables a "private app store" for your mobile app development shop, or enterprise. Great for beta testing before launching an app public. Besides mobile, this can be used to distribute Mac or Windows apps also.
The major difference is Knappsack is not limited to beta testing and is not limited to mobile apps. Knappsack supports those use cases well but it also works great for controlled distribution of production apps.