Expanded Skill System:
There are a lot of skills in DnD 3.5, Over 100 official ones, and my setting has added more due to it's technology. As such, without having to completely uproot the system, I'm adding a special way to spend skill points, in the form of Skill Spheres.
Skill Spheres: Any class is capable of putting skill points into "Skill Spheres" instead of normal skills. A skill sphere is essentially a grouping of skills all grouped together, they do not replace the old skill system, rather supplement.
All skill spheres are "class skills" for every class, but ranks in a skill sphere do not immediately provide a benefit. For every two points placed in a skill sphere, you recieve a +1 bonus to any class skills within this sphere. A cross-class skill within a sphere receives a +1 bonus for every 4 ranks you place in the appropriate sphere. This bonus stacks with all other bonuses, and count as ranks for the purpose of whether you are trained or not in this skill.
For simplicities sake, if you place ranks in a sphere with a skill that is forbidden to your class (such as Use Magic Device with a Fighter) and it later becomes a cross-class or a class skill, you receive the bonus retroactively on all points spent into the skill before it. If this skill again stops being a class skill in subsequent levels, it will gain bonuses at the slower rate (or no rate at all for a forbidden skill) until you once again take a class where that skill is cross-class or a class skill.
Sleight of Hand
Use Magic Device,
Use Psionic Device,