Which are the parts of the Old Testament that point to Jesus? I'm aware of the prophecy in Genesis about someone who will crush the serpent's head, as well as the parts of Isaiah, especially the Suffering Servant. Which other parts of the Old Testament point to Jesus?
Prototypes of Jesus can be thought of as falling into the following categories:


Prophecies

In these kinds of references, a man of God delivered a message which would be fulfilled in Jesus.  Isaiah 53, to quote one famous example, speaks of a suffering servant who would be "beaten for our iniquities and wounded for our transgressions." "By his stripes, we would be healed."  Isaiah 7 speaks of a virgin* who would conceive. (The asterix b/c I know the issues involved in that.) Jonah foreshadows Christ in that a man who was (bascially) dead for three days ("in the belly of the whale") comes to preach repentance. As Yul Brenner would say, 'etcetera, etcetera, etcetera.'  Hosea marries a prostitute who keeps leaving him, prefiguring Jesus coming to his own, and his own receive him not.  

The primarily prophetic books would be: Isaiah, Jeremiah, Ezekiel, Daniel, and the Minor Prophets
Ceremonial / Law Fufilment

The Torah - aka the Pentetuch - and especially the latter half of Exodus and all of Leviticus and Deuteronomy - record the sacrifices, rules, and details about worship collectively called "the Law."  Jesus said that he came "not to abolish the law, but to fulfill it."  He came as the sin offering.  He came as the Jubilee.  He came to "cleanse people from their sins," and so on. When Jesus' parents "redeem" him at the Temple, bringing the sacrifice the poor person is supposed to offer, Jesus identifies with the lowly. In these parts of the Old Testament, the types of Christ are ceremonialily pre-figurative. This is made explicit in Matthew, when John initially refuses to baptize Jesus, but Jesus insists, saying, "this is necessary to fulfill all righteousness."
Literary Allusion / Symbolism

In the "Ketuvi'im" or the Writings (Joshua - Song of Solomon), Jesus is most often seen as the target of an allusion.  In Song of Solomon, a woman is erotically charged as she comes to greet her lover - and for years the church has insisted this is typical of the relationship between Jesus and his bride.  In Psalm 22, a forsaken man cries out, "My God, My God, why have you forsaken me?" the same words that Jesus cries from the cross.  
Historical Parallel

The Book of Exodus, of course, is God rescuing and redeeming his people. As just one example, the Passover meal is later used by Jesus to prefigure his death, and is later appropriated as what is now called "Communion" or the "Eucharist."  In 1 Samuel - 2 Chronicles, a kingdom is established through David, over which Jesus would rule forever.  The idea is that the grand sweep of history is often summarized as "Creation. Fall, Redemption" and is seen as the "story of God"


In all of these things, Jesus is said to be the one prefigured, because the book is about Him.  Scholars disagree over the exact numbers of references, but most agree that Jesus is prefigured in every book of the Old Testament. (The more liberal ones would say that there are symbols to which Jesu appropriates or s at least alludes when he comes.)  To list them all, however, would be a book.

One final little allusion, however, that bears some consideration, is the story commonly called "the Transfiguration."  Jesus goes up to a mountaintop, whereupon Elijah and Moses greet him.  Now, you should know that Jews refer to the Old Testament in two categories - "the Law" and "the Prophets."  Moses, as the "lawgiver" who brings the 10 commandments off of Mount Sinai.  Elijah was the most famous of the prophets, working miracles and boldly declaring God's truth to a wicked King.  In standing between and amongst these two, Jesus himself declares himself to be "the Law and the Prophets," a nice little picture saying that indeed, Jesus is the Word this Old Testament has been preaching all along.