Add 2006 and 2004 to the list of under seeded teams. 2006 in particular was robbed--top 10 team all year, projected as a 2/3 seed, end up a 4.
In fact, here are our NCAA seeds and final KenPom ratings from 2002-06:
2002: 4 (8)
2003: 4 (5)
2004: 5 (13)
2005: 1 (2)
2006: 4 (9)
In an era before the committee relied on analytics, one wonders how different our NCAA history would look if we had been given the opportunity of a bunch 2 and 3 seeds during what was already a golden era.