A few days ago I had one of those drunk conversations on the importance of space exploration. A chunk of it was spent on trying to remember and figure out which technologies do we enjoy now that were initially develop for or during space missions. Today, on this slow Saturday afternoon, I remembered the conversation and had a brief look around. There are plenty of websites that show the top 10 or just a random collection of technologies that improved live on Earth, after being used in space. But I think the better, all around, one is the Wikipedia page on NASA spin-off technologies.
There are quite a few things listed there, grouped and categorized under health and medicine, transportation, public safety, consumer, home, and recreation, environment and agriculture, computer technology, and industrial productivity.