Ezekiel 37

1 The numbers of dead after a battle would sometimes be so great that there was neither the space nor manpower to bury the bodies.
2 The dry bones were indication that the bodies had been dead a long time.
3 Ezekiel had never seen anyone come back to life, but he undoubtedly knew that God had raised others in the past (recently dead, though -- not yet decomposed). Ezekiel is hesitant, but he is wise enough to know that God can do the unimaginable.
7 Even though the request sounded strange, Ezekiel was obedient. Of course, as with all of God's prophesies, it does not matter if the people will hear or understand -- it will come to pass just the same.
8 God had physically brought the bones together in their proper manner and had re-grown flesh on them, but now they were like dead bodies.
10 Ezekiel now calls for the breath of life to enter them. This shows the life-giving power of God and can also symbolize the spiritual renewal of the people. Since the following prophecies have not yet been fulfilled, this vision may be applicable to the Resurrection.
11 God has given a visual illustration based on an idiom the people were using. They saw their condition as hopeless, but God wants to make it clear that those who follow Him always have hope.
12 Again, this could reference the Resurrection and the New Jerusalem, spoken of in Revelation. It might also mean that God would take them out of the "grave" of exile and physically return them to the land. Certainly, the latter was fulfilled, so this may be a "double prophesy," meaning that it is fulfilled in a small way immediately, but has larger implications in a future fulfillment.
13 Such feats would undeniably be the work of God, and even more so since He predicted them.
16 Judah represents the Southern Kingdom and Ephraim represents the Northern Kingdom of Israel.
19 This prophecy is amazing because the Northern Kingdom in particular was defeated and intermixed with pagan nations. Either God has a different way of defining who belong to the Northern Tribes of Israel, or this would again refer to conditions after the Resurrection. In the latter case it could refer to true Israelites raised from the dead, or be an all-inclusive illustration. We are later told that Gentiles would share God's Kingdom with Israel by faith in Jesus, and at least some of the "Gentiles" would have some Israeli in their lineage.
22 Since this prophecy Jews returned to the land, were scattered again, and in modern times re-inhabited the land. However, this falls short of the prophecies here in that the Northern Tribes have not joined them (which seems impossible anyway), they don't have a Davidic king, and sin is still rampant in the land. Again, this would seem to support the idea that the prophesy refers to the post-Resurrection Jerusalem where Jesus will rule as the final Davidic king over all kinds of people from which sin has been removed.
26 This is still more support for the idea of the post-Resurrection Jerusalem. As is prophesied in the New Testament, Jesus' Second Coming will mark the permanent establishment of His Kingdom. At this time God has promised to live with the people. Even though we know that God is always around us, the idea is that our relationship with Him will be more intimate and completely unhindered by sin.
28 Some nations will know this because they will be sharing the Kingdom with Israel. Others will know it only in contrast to their eternal punishment.