Duke
It is really surprising that no other SEC school, other than Tennessee, has won an NCAA title.
Here is a breakdown on the major conferences and the number of different schools that have won NCAA titles.
Big 12: 4 (Baylor, Tx Tech, TAMU and Texas)
Big East: 2 (UCONN and ND)
ACC: 2 (UNC and MD)
PAC10/12: 2 (USC and Stanford)
SEC: 1 (Tennessee)
Big 10: 1 (Purdue)