12 teams are ranked in the Top 25 that were not ranked in the Top 25 Preseason, as follows (I used Sports Illustrated):

Alabama (1)
Utah (7)
Boise (9)
Okla. St. (13)
Ball St (14)
MSU (15)
UNC (16)
TCU (18)
FSU (19)
Tulsa (23)
Wake (24)
S. Car (25)

Coversely, here are the teams that were ranked that are not currently in the top 25, with their preseason ranking:

Auburn (8)
Wiscy (9)
Kansas (11)
Tenn (12)
Clemson (13)
WVU (14)
Ariz St (16)
Va Tech (17)
Oregon (19)
Illini (21)
Or St (22)
UVA (24)

     Of the top 25, there are also some teams that moved both ways. LSU was ranked 6 in preseason, they are now #20. Penn St was #20, they sit at #6 (but that will fall in 2 weeks!). Texas Teck and Texas are #2 and #3, and they were #10 and #15 preseason.

I have no affiliation with rivals, spartan mag, staudt on sports or any sports recruiting agency