I just read this outstanding NYT article on 'sanctuary cities' - places in which public officials (rightly, IMHO) do not count it among their duties to sniff out and apprehend undocumented immigrants. Among the items it touches on are:
presidential politics (Mitt vs. Rudy)
male vs. female labor (undocumented immigrants mowing the lawn = ok; the same providing child care = not ok)
public health and safety
Plenty of other immigration news out there too...including a Catch-22 story from work. More later.