Mark Horner has a new post suggesting the creation of an open assessment bank. The bank would receive contributions from teachers and would be a stepping stone to contributing to Connexions. From the post:
If we support communities of teachers sharing, adapting and enhancing assessment items in iterative, open and transparent ways it will save individual teachers’ time, provide assessment items of the highest quality and enhance the sharing of innovative ideas.

Qedocs already offers a robust open assessment bank. Take a look – http://www.qedoc.org/