The meaning can take any of different shades depending on the context. I would guess that this is in the positive sense of 'motivated', so you can translate as :
شخص مدفوع أو مندفع - نحوهدف أو غاية- أو حتى متحمس و مثابر لتحقيق هذا الهدف

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Note added at 8 hrs 6 mins (2005-12-15 06:51:22 GMT)
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The source context helps narrow down your choices.
It is obvious that the piece praises the 'driven team' for the value they added to the products. This means that you can rule out مسير , منقاد ومندفع because they have negative senses in Arabic.
The 'drive' in this context comes from within the person or team, so I would rule out مدفوع
If I were you I would use : فريق عمل مثابر
لأن صفة المثابرة تنبع من ذات الإنسان وليست عاملاً خارجيا. يمكنك استخدام "متحمس" أيضا ولكن مقابلها الانجليزي كما نعلم هو
enthusiastic.
In my dictionary the word ثابر is translated as : To apply oneself diligently to one's work, so I think it fits the context best.