we are currently testing both the Media selector and the Page selector, which are going to be part of the K12 Service Pack.
DavidDanny Winbourne commented
@sean - thanks for this, only just seen as I didn't receive a notification when you replied.
I'll see if we can add to our project.
Sadly, I don't think we have sufficient time in the budget to implement a URL/Content picker which would be even more useful