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Release notes
This is the initial release which supports altering all view filter forms.
This module alters views' filter forms so that the drop-down or select box widgets are represented as checkboxes or radio buttons instead. This initial release satisfies all the immediate needs I had for such a module, but I may expand it in the future to only alter certain views and leave others to the default display. Currently, a single checkbox on the admin page controls the entire module.
Honestly, this is probably better solved with the views module itself, and it is a registered issue there: http://drupal.org/node/122261
But for those who want to effect a global change to all view filter forms more quickly, this module should satisfy that need.