Here's good news!
Remittances are Mexico's biggest source of income, says Fox:

Money sent from Mexican workers in the United States to their families back home has reached a record $12 billion in 2003, Mexican President Vicente Fox said Wednesday.

Remittances "are our biggest source of foreign income, bigger than oil, tourism or foreign investment," Fox told reporters after a meeting with Mexican-American businessmen.

No report on how much is from illegal aliens, but I think we can, as a rough estimate, say it's a huge honking lot.

Fox said the money transfers grew after Mexican consulates started giving identity cards to their citizens in the United States.

"The cards are working. All doubts have been cleared up," Fox said. "Almost 2.5 million people have them, and we want all Mexicans to have them."

So they can all sneak over the border I guess.

You really have to wonder about a political leadership whose economic development plan seems to be to sneak as many of its citizens as possible over the border of a big doofy neighbor and have them send back cash.