There are different "uses" for this book - some I'd recommend, and others not.
I WOULD NOT recommend this book for it's insights on -
Economics: Ford explains a classic industrial notion that a company paying employees more will increase its sales because employees will buy more company product. Not only is this a false assumption of employee behavior, it also only approaches plausibility for very large consumer product companies.
Finance: Ford describes how financial instruments are short-term narcotics and long-term ills. His opinion seems to ignore the buffering benefits of finance, as well as the gains created for society by letting financial tools open possibilities.
HOWEVER, YOU SHOULD READ THIS BOOK BECAUSE -
It is current: Ford describes a organizational skill poorly understood and mostly ignored: coordination. In the book, many processes are described that Ford says are all well known to other companies, but how the Ford Corporation made the processes interact was their power. Today's out-sourcing is more palatable knowing this skill.
It is insightful: An excellent alternative to the "profit-motive" of companies is presented: service-motive. Not because profits are bad does Ford present the service-motive, but because profits are give unreliable feedback. Ford sees the maintenance of service to the public as a more durable goal.
It is historical: Not only does it provide the roots to Taiichi Ohno's - Toyota's - operations strategy, but it also gives clues to why Ford lost dominance. The Toyota roots pop up in Ford's writing on waste, on cleanliness (5s), on continuous flow, and on timing. The clues pop up with his ignorance of customer desires vs. needs, his overconfidence in managing highly diverse businesses, and his inattention to downstream processes.
If you know the limitations of Today and Tomorrow, you then can reap great benefits by reading it as if it was written last week. Many of its ideas have yet to fully play out in the world of industry.