Another point that the pollyannas are missing here is that although any NEW hires of undocumented illegals will require that the employer prove that Americans don't want the job, the estimated 8 to 12 million existing illegals who are currently illegally employed will be grandfathered in -- no proof will be required that the jobs can't be filled by Americans, per the Bush plan. Rather convenient for employers.
The same document is also rather blunt in stating that this three-year work visa will be renewed, indicating that the three-year term, as well as the "Americans don't want the jobs" stipulation, are window dressing. These will esentially be work visas in perpetuity -- all carrot and no stick.
It's spelled out by adminstration officials in the conference call posting on the White House site, linked in an earlier post.