Unfortunately, it looks like Senator Frist's "enforcement-only" immigration bill has a few hidden surprises that would make it almost as bad as the other bills the Senate will consider. Here's the number of legal immigrants allowed under each bill over the next ten years:

20 million under Sen. Frist's bill (S. 2454)
25 million under the McCain/Kennedy bill (S. 1033)
30 million under the Specter proposal (no number)

A little more on this here.