Meanings change

Sitting in class today I actually had somewhat of an epiphany. Getting lectured about nouns in old English led me to think about words that we use today that mean something completely different than what they meant 30 or 40 years ago. I also wonder about some nouns that are now verbs...like google (ex. "I googled H1N1 only to discover that I have all the symptoms). How many other nouns can be used (and make sense) as verbs?