The 1990 NCAA Division I-A football season ended with a split national championship and the ensuing controversy helped lead to the creation of the Bowl Coalition, a precursor to the Bowl Championship Series. The national title was split between the Colorado Buffaloes and the Georgia Tech Yellow Jackets. The Buffaloes (11-1-1) took the AP poll while the Yellow Jackets (11-0-1) took the UPI Coaches poll by one vote over Colorado, 847 to 846. During the season Colorado had a particularly controversial victory over Missouri in what would later be known as the "Fifth Down Game".
Arkansas State moved up from Division 1-AA to become a Division 1-A independent bringing the total number of Division 1-A teams up to 107. Taken from http://en.wikipedia.org/wiki/1990_NCAA_Division_I-A_football_season.

Final stats:

Rank	Team	Coach	Top NFL Player Drafted in 1991
1	Colorado	Bill McCartney	DE Alfred Williams
2	Georgia Tech	Bobby Ross	LB Calvin Tiggle
3	Miami (FL)	Dennis Erickson	DT Russell Maryland
4	Florida State	Bobby Bowden	WR Lawrence Dawsey
5	Washington	Don James	DB Charles Mincy
6	Notre Dame	Lou Holtz	RB Ricky Watters
7	Michigan	Gary Moeller	RB Jon Vaughn
8	Tennessee	Johnny Majors	T Antone Davis
9	Clemson	Ken Hatfield	P Chris Gardocki
10	Houston	John Jenkins	LB Reggie Burnette
11	Penn State	Joe Paterno	RB Gary Brown
12	Texas	David McWilliams	DB Stanley Richard
13	Florida	Steve Spurrier	DB Jimmy Spencer
14	Louisville	Howard Schnellenberger	NT Ted Washington
15	Texas A&M	R.C. Slocum	LB William Thomas
16	Michigan State	George Perles	LB Dixon Edwards
17	Oklahoma	Gary Gibbs	TE Adrian Cooper
18	Iowa	Hayden Fry	DB Merton Hanks
19	Auburn	Pat Dye	G Ed King
20	Southern California	Larry Smith	T Pat Harlow
21	Mississippi	Billy Brewer	DT Kelvin Pritchett
22	Brigham Young	LaVell Edwards	DB Brian Mitchell
23	Virginia	George Welsh	WR Herman Moore
24	Nebraska	Tom Osborne	LB Mike Croel
25	Illinois	John Mackovic	DB Henry Jones