CREATE TABLE table_1901751_1 (original_australian_performer VARCHAR)

Who is the 2005 World AIDS Day Benefit 'Dream' Cast when the Original Australian performer is Susan-Ann Walker?
SELECT 2005 AS _world_aids_day_benefit_dream_cast FROM table_1901751_1 WHERE original_australian_performer = "Susan-Ann Walker"
SELECT 2005 AS "_world_aids_day_benefit_dream_cast" FROM "table_1901751_1" WHERE "Susan-Ann Walker" = "original_australian_performer"