In some respects Peter may have been misled by Jesus' word at first, but he later realized the true meaning of them when he said "But do not ignore this one fact, beloved, that with the Lord one day is like a thousand years and a thousand years like one day. The Lord does not delay his promise, as some regard "delay", but he is patient with you, not wishing that any should perish but that all should come to repentance."(2 Peter 3:8) It is certainly beneficial to us to live every day like the last so this message brought forth.
I'm not sure what the author of http://www.secweb.org/asset.asp?AssetID=86 is trying to say with the book of Revelation being unsealed. Most of the book revelation can be derived by Daniel, Isaiah, Jerimiah, and the book of enoch anyways. The sealed portion of Revelation is the voice of the 7 thunders.
Paul explicitly states the end of the world cannot occur until the gospel is preached to all nations as said in Isaiah.
shall be caught up...in the clouds to meet the Lord in the air!" For Paul there was no doubt that Jesus would arrive before he and the believers he addressed would all be dead."We," including himself, "shall not all sleep" [1 Cor 15:51].
"We shall not all fall asleep, but we will all be changed, in an instant, in the blink of an eye, at the last trumpet. For the trumpet will sound, the dead will be raised incorruptible, and we shall be changed." Paul is clearly stating that the last trumpet will wake up the dead. It is not a claim of not dying.