A-Millenialism
Amillenialism, in which the Church stands in Proxy of Christ, is the belief that the 1000 year reign or millenial reign of Christ and his Saints; is to be seen as metaphor, or spiritualized where, depending on the brand of Amillenialism one may have a literal 1000 year reign with the Church as the governing agent, or an 'era' of time in which the Church representing Christ on earth reigns (sometimes seen as from literal Jerusalem sometimes as 'spiritualised" Jerusalem but where no literal return of Christ in physical form occurs. There are 'newer' forms of Amillenialism in which the Church reigns in preparation of the return, and the return is seen in a variety of ways. Among Churches espousing a form or type of Amillenialism are: United Methodist; United Presbyterian USA, Roman Catholicism, some more Liberal Evangelical and Assembly of God theologians espouse the view; and among those with new brands are 'dominion theologians' and some 'replacement' theologians.
Pre-Millenialism
Pre-Millenialism, most firmly held by Evangelical, Baptist, some Pentecostal and other Fundamentalists is the belief that Jesus Christ, in His Full Person and Godhead, will literally, as he covenanted with Israel return as he left(Matthew xxx); Visibly and on the clouds, to rule and reign. A literal interpretation of the Scriptures is expounded and a hopeful watch for a real Messiah is taught.
Post-Millenialism
Post-Millenialism is the most unusual of the positions. Post-Millenialists interpret the 1000 year reign of Christ as having already occurred in the past. It is similar to Amillenialism in that it sees a Church age, a church in proxy of Christ as fulfilling scripture. It differs significantly in the belief that the 1000 year reign of Christ, promised in peace and prosperity with Christ ruling with a rod of Iron, already occurred, following the early church period, with Christ reigning figuratively. The difficulty many have with this position is that the descriptions of the Millenial Reign do not fit with historical descriptions: there has been no place in history where for a thousand years, world peace was established, with no sorrow, pain or trouble, or where 'the wolf lies down with the lamb' or children play on asps nests. Even if one takes these passages broadly and metaphorically, the Thousand years following Christ's death were bloody with massacres, persecutions, false church systems and brutality. While the Roman Catholic Church growing out of the Holy Roman Empire did reign, the corruption was so massive that it could hardly be described as reigning metaphorically as Christ. Secondly, the events described in the Bible detail Satan as being bound, not just restrained but removed from power during the Millenium. If anything, the opposite was true.
I got that from a website... this is another of their pages, about A-Millenialism...
http://www.shoaheducation.com/amillenialism.html
Which Millenial Reign is it?