From this:

An anonymous group [note: using the name Concerned Citizens of the United States] says it quietly watched Hispanics in their neighborhoods, schools, churches and "public welfare buildings" to compile a list of 1,300 people it says are illegal immigrants living in Utah. The group sent the list to law enforcement agencies and news media demanding that those named "be deported immediately." ...It is not known who produced the list, although Gov. Gary Herbert has called for an investigation to see if the list was compiled by someone with access to state databases containing personal information. The list contains birthdates, workplaces, addresses, phone numbers and social security numbers. Names of children are included. Several pregnant women have their exact due dates listed. All the names seem to be Hispanic.

1. This is highly counter-productive because it puts illegal aliens in the position where their advocates want them: as teary victims of racist oppressors.

2. Not all of those on the list might be here illegally; this raises the specter of other lists that have been used throughout history.

3. No one should expect officials to start deporting people just because they're on the list; in fact, the opposite might happen with politicians rushing to their defense.

4. It'd be surprising if they got all the information on the list legally, and state officials aren't going to give them a pass where they would give a pass in the opposite situation.

5. All the time spent on the list could have been spent on legitimate and highly-effective plans like question authority.

UPDATE: From this:

on Friday morning [July 16], Utah Attorney General Mark Shurtleff stood side-by-side with Paul Mero, of the Sutherland Institute, Catholic Bishop John Wester, state Sen. Ruz Robles, and representatives of the National Council of La Raza and the National Immigration Forum.

This site tries to discredit the last two groups; those who leaked the list helped them. Some of the fault of this lies with various political leaders; instead of promoting plans like question authority, they promote ineffective or low-wattage activities.

7/31/10 UPDATE: "The List" continues to help far-left supporters of illegal immigration. On Friday, 121 groups sent a letter to the Department of Homeland Security asking them to denounce the list and refuse to use it (link). Those behind the letter include the American Civil Liberties Union, the National Council of La Raza, Human Rights Watch, FamiliesUSA, Hebrew Immigrant Aid Society, and other religious groups.