If you think about it, computers could be the ultimate strategy tool. What to do in any situation, and webcam record signs ....etc.
I need the history buffs on this one (tried Googling but to no avail)... wasn't there an issue with walkie talkies being used in the 1975 or 1976 World Series? Depending on the year either the Red Sox or Yanks had someone out in CF by the scoreboard. TV cameras caught this person using a walkie talkie and I think the other walkie talkie was in their dugout. MLB got involved and banned their usage. It caused a pretty big stink at the time IIRC.