Sees dead people:
Jeff Goldblum
Jennifer Love Hewitt

Sees the future:
Nicolas Cage
Sandra Bullock
Henry Ian Cusick
Santiago Cabrera
Milo Ventimiglia and Zachary Quinto (by way of Cabrera)

Sees dead people and the future:
Patricia Arquette

Sees the past:
Denzel Washington

Sees the past and the future:
Anthony Michael Hall

Sees the present only:
Taye Diggs

Sees the past and the future in the present:
Masi Oka
David Tennant

Seize the day:
Robert Sean Leonard