Rendered with my 8600M GT, it's still doing a pretty good job despite its age :) The caustics from the glass sphere are not reflected in the mirror ball because max path length is set to 3 for performance reasons. Setting max path length to 4 will show the reflection of the caustic light pattern.
Download executable: http://code.google.com/p/tokap-the-once-known-as-pong/downloads/list
Increasing the emission values (RGB) of the "sun" to 4, 4, 2 makes the caustics more obvious:
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