When my grandfather "died" after a heart attack, he ended up seeing a door with light coming from under it, and he saw himself floating above himself. He was resuscitated and went on to live for two more decades.

My personal belief is that we will all stand in Judgement before our Creator and have to give an account for every action (whether right or wrong) that we have committed. We will receive an eternal reward or an eternal punishment; those who did only good in their lives will go to Heaven, and those who have done any wrong will burn in Hell for eternity.