The "Hey, It Was All Just a Crazy Dream" Ending
The "Hey, It Was All Just in the Mind of a Mentally Disturbed Person" Ending
The "Hey, Everyone Just Totally Died...or Did They?" Ending
The "Hey, Why Did They Just Jump Ahead in Time?" Ending
The "Hey, That Didn't Explain Jack S*$&" Ending
For the complete article, and explanations of the endings and clips of shows that ended in just that way, go here to read the article:
I am thinking there's pretty good odds on something akin to one of the above will be "The End" of LOST. But I am going to watch every last second and if need be, go down with the island .... lol ....