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It's not a 3.5 source, exactly, but Pathfinder's "Ultimate Magic" greatly expands on the 3.5 guidelines for spell design. It includes lists of 'benchmark' spells and detailed justifications as to why they should be used as a basis for comparisons, and also describes different categories of spell effects and why they're important from a balance and gameplay perspective.

It's not a 3.5 source, exactly, but Pathfinder's "Ultimate Magic" greatly expands on the 3.5 guidelines for spell design.

It's not a 3.5 source, exactly, but Pathfinder's "Ultimate Magic" greatly expands on the 3.5 guidelines for spell design. It includes lists of 'benchmark' spells and detailed justifications as to why they should be used as a basis for comparisons, and also describes different categories of spell effects and why they're important from a balance and gameplay perspective.

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It's not a 3.5 source, exactly, but Pathfinder's "Ultimate Magic" greatly expands on the 3.5 guidelines for spell design.