Skill Knowledge

(Unearthed Arcana, page 81, DnD 3.5)

[General]

You gain access to new knowledge and abilities.

Benefit

Choose any two skills from one of your current classes' skill lists. You now know these skills as class skills.

Special

Instead of choosing two class skills, you may choose one cross-class skill (whether you already know it or not) and learn it, treating it as a class skill from that point forward.