Managing Wireframes and Screen Mockups

What workflows/tools have people used to manage wireframes and screen mocks for new projects? Problems that I've encountered in the past:

* The IA (wireframes) are different from what is present in the Photoshopped screen mocks and it's unclear which is the most current
* There are problems linking a wireframe/screen mock to a story. The files tend to be in a zip or PDF and you can only link to the overall document
* The wireframes tend to get uploaded to sharepoint and then never updated from there


What approaches have teams used to success when bridging the gap between design and development?

Answers