8 things my kids don't get that were common when I was their age:

• Paper encyclopedias
• Over the air TV
• Vinyl records
• Getting together a bunch of kids to play a pickup game of baseball, touch football, street hockey, basketball, etc. (I find this one kind of sad).
• Having to watch a TV show when it's actually scheduled.
• Riding a bike without a helmet (this one's a good thing. Read this.)
• Having to consider the expense before making a long distance call.
• Being able to walk up to Fenway Park at game time and get a decent seat for a Red Sox game for a reasonable amount of money.