Dadabhoy

This is what you are talking about. .: Reaction Ball&#8482 - Power-Systems.com :.. I have wanted to get this. It improves both reaction time and hand eye co-ordination. Perfect for everyone, especially goalies.

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bwhite89

Best thing for hand eye coordination in my opinion is handball. Pretty much hitting a fast ball with your hand. I play some raquetball which is good hand eye coordination also.

foolz.sight

teach someone how to throw lacrosse...its a guessing game where they're going to throw it!
walls are good practice
hand/raquetball are both good..along with ping-pong
throwing a tennis ball around a dorm hallway with someone is good..if your objective is to get it by the other person it makes for an interesting game.