Dude...really? The one post you make that doesn't contain a matrix.reference or picture of some book or link to an nde site is a bible quote without discussion in an alternative section?"Beloved, now we are the sons, (children), of God, and it doth not yet appear what we shall be, but we know that when He shall appear we shall be like Him, for we shall see Him as He is."
1 John 3:2
I know that the Zen Master Hakuin discussed samadhi and various samadhi experiences he had. And I know that some literature equates the samadhi experience to the nirvana experience.
I think there may also be discussion of it in the writings of Swami Vivekananda and of Sri Ramakrishna.
I recall reading that when some saints enter into the trance of nirvana, they tend to choose not to return to earth...whereas, if I recall, it is easier to come back to earth / life, after entering into samadhi.