Immigration Counters
This site keeps a running total, digital clock-style, on various numbers about illegal immigration. The sourcing of the data appears to be excellent.
Center for Immigration Studies.
A very reputable organization of long standing.
NumbersUSA
This site has a wealth of data on what the huge numbers of illegal aliens in the U.S. will mean to the nation from various perspectives over the decades to come.
Immigration's Human Cost
This site illuminates the stories of crime and other human tragedies visited upon Americans by illegal aliens. The cost is high. The stories are validated.
Honor First
This is an unofficial site containing a lot of information about the Border Patrol, from history to current operations to recruiting. It is maintained by a retired Patrol Agent.
STRATFOR
This link is to an article from STRATFOR examining the link between Barrio Azteca, a U.S. based street gang from El Paso, and the Mexican drug cartels.
STRATFOR is the largest, and arguably the best, private intelligence firm in the world. There will be other links here to their material.