In case you forgot, one of the best finales I've ever seen. The End finale was such a perfect and explanation for the entire show. A writers had a perfect explanation of the 'after-existence', or afterlife as I would imagine it at least, and it was perfectly encapsulated into the final scenes.
|Christian Shephard explaining things to Jack...|
"The most important part of your life, was the time you spent with these people. That's why all of you are here. Nobody does it alone, Jack. You needed all of them, and they needed you."
In case you'd like to watch the last few minutes, the second video follows right after the first: