What are key the hurdles in the Business/Technical relationship? How can the 2 marry up and maintain a good relationship to deliver the end result?

i really don't see how they can clash except for sales to ask for a perfect  marketable product.

you have to understand if technical/engineering  fails to deliver a quality product,the sales team will get the criticisim,they are the front line and customer interfacers.

i worked in sales and procurement and i can relate to this matter.in sales we always gave feed back to manufacturing of what exactly the customer needs and expects,we have reportedproduct  failures,competitor advantages...etc.

i really don't see the clashing but i do see misscommunication.

Strong Project Coordinator, Business Analyst, Contracts Manager and Finance Manager together synchronize well business with technical or technical with business

It is like clash between an architecture & civil job in , it is important for both of them to coordinate in getting the task accomplished successfully. Integration of ideas is important in getting the task accomplished other wise the wave lengths doesn't match and the entire project goes for a toss. While planning it is important to sit both of them take brain storming session and conclude giving importance to both the functions..

Business clashes with technology if (and only if) you implement technology for the sake of technology.

If you identify the goals aligned to your strategy and then identify and implement the technologies which empower the effectiveness and/or efficiency of those goals, business and technology will never clash.