IMO,
If was Bruce was alive and they were both in their prime, I am pretty sure Bruce would win(street fight definately, boxing...probably so). Alot of my reasons have already been stated(Lee is faster, more or at least as powerful, has trained with no restricting limits, trained in all ranges, in a better mind frame of actual combat, ect.)
Now if the situation was Bruce vs. Tyson that knew JKD, I am not really sure. There are too many more things needed to know about a JKD/Boxing Tyson. Some include:
1. How much dedication and time has Tyson put into his JKD?
2. Has Tyson really got the message about what JKD is about?
3. Has he had street experience, or just in the ring.
Swordfish
My new and improved forum
http://www.network54.com/Hide/Forum/270276