I don't watch football, so I don't know how necessary a technology this is (I'm guessing "not at all" would be the category), but here are some inventions that need to be looked into by those who do such things. (Yes, I'm mostly kidding, but wouldn't some of these be useful?)
Wouldn't it be great if someone invented some kind of label highlighter or ink that would change color with the year? For example, new books each year would have the year on the Library of Congress code highlighted in, say, green, which would degrade slowly over the year to a different color--maybe yellow--and then on to brown, until after the 3rd year they'd just be regular white labels. There wouldn't be a new color for each year; they'd just have to invent one kind of ink that would do this and use it to highlight the year on the label (or maybe the entire label).
Of course there are fantasy inventions--the keys that shout "I'm right here, stupid!" when I'm looking for them, or the illuminated signs for cars that would say "Back off, fool! Tailgating won't make me go any faster, not in this fog"--but they're pretty ridiculous. I really would like to see the label thing, though.
What inventions would you like to see?