Is there a simple way to organize fonts into folders and switch between them?

As a graphic designer, I have a large number of fonts installed on my PC (WIN XP SP3). I need the variety, but the many fonts slow my applications considerably. Is there a simple way to organize fonts into multiple folders and switch between them, preferably from within applications? The only way I know to swap font files is to organize the fonts into folders, and rename the folders to "Fonts" as I need each one. That would be terribly cumbersome.

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