What are some easy dice games to play?

There's always Yahtzee. If you have the time and people, and the correct equipment (rule books, dice, etc.) Dungeons & Dragons is a great game. It's like a computer RPG, but played with dice. Also similar to Dungeons & Dragons, but with a handful of differences is Warhammer (and Warhammer 40,000 which is set in the distant future).