Reg: Feat
In the Kingdoms of Kalamar Player's Guide there's a feat that allows the player to pick up to their Intelligence modifier in additional class skills or even turn exclusive skills into cross class skills if desired (and you're playing 3.0 rather than 3.5).
I believe its called Skill Prodigy or something like that (don't have the book next to me unfortunately).
It really depends on the skills you want to add to your class skill list, if its Listen, Search and Spot pick up Alertness and then get the Encyclopaedia Arcane for Divination and select the Vigilant feat which grants those very skills.