CHDK is ported for SX10IS firmware 1.01a and there is current development work (as of 10 Jun. 09) for versions 1.02b and also for 1.01b.
How to check your firmware version: http://chdk.wikia.com/wiki/FAQ#Q._How_can_I_get_the_original_firmware_version_number_of_my_camera.3F
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