All the Texas schools. Baylor on AMCAS goes back 5 years. The TMDSAS schools (UT Southwestern, UTMB Galveston, UT San Antonio, UT Houston, Texas A&M) all go back 5 years except for Texas Tech which goes back 4.
I think Univ of North Carolina takes 5 years as well as U. Maryland.
The admissions people at Hopkins and Yale told me they take 4-year old MCATS. For example for the current cycle (matriculation year 2006) they'll accept 2002 scores.
I'm sure a lot of schools fit your criteria.