The Cinco de Mayo holiday is celebrated nationwide and in some places in Mexico. It has become a time to honor Mexican culture and heritage.
Which Way Home? is the Academy-Award nominated film by Rebecca Cammisa documenting true stories of some of the migrant children who make the perilous journey unaccompanied from Central America through Mexico to try to reach the United States, seeking to re-unite with their parents or simply to find a better life. These stories illustrate how U.S. immigration and border enforcement policies affect families thousands of miles away who have no recourse but to migrate without documents so as to find opportunities for work.
This is a new documentary concerning immigration into the United States through Mexico via railroad trains.
I haven't seen it myself, and so can't recommend it. It was just released March 8, 2011. Its mostly in Spanish.
Here are two English and one Spanish trailers from the film. The home page for the film is: here.