From what is emerging from the blogosphere and news world, Judge Alito is in the mold of Antonin Scalia. Scott Lemieux predicted this, here he links to several informative blogs on this pick.
I will say that I appreciate a comment that Bush just made: "[Alito] understands that judges should interpret the laws, not impose their personal preferences . . ." (or something close to that).
Yes, the a SCOTUS justice needs to interpret, which is an intellectually rigorous activity, aided by a judicial philosophy. So, it begins again . . .
UPDATE: Yes, yes so he is fair, temperate, judicious . . .blah, blah, blah. Show me, don't tell me!