This question is similar to many questions that find a command in the Old Testament and ask if it should apply to Christians today.
It is important to note that the Old Testament refers to the Old Covenant. God has made several different covenants with different people at different times. The covenant which is of note here is the one He made with Abraham, the father of the Jewish people.
In this covenant, God committed Himself to blessing Israel in very significant ways--He would bless their land with rain and crops; He would protect them from their enemies; He would reveal Himself to them; and He would send the Messiah to them.
This wasn't a one-sided covenant, though. Israel was obliged to follow not a few rules and regulations, of which not eating pork was one of them. Also, Israel was to proclaim God and His ways to the entire world.
This covenant was in effect until the coming of the Messiah (Jesus). The Old Testament even speaks of a time when God would give a new covenant. Since Jesus rose from the dead, we are now in this new covenant.
So, if you or I were Jewish people living between 2000 B.C. and 33 A.D., then this command would most definitely apply to us. Since we are not Jewish and do not live in that time period, those rules do not apply to us.