It's difficult to tell what the problem is there.Does toggling the capslock key toggle the led? If so, then at least the adapter and ps2 keyboard are talking.

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False alarm - I had the adapter board connected though both the ADB and pre-ADB interfaces at the same time. :I That probably didn't help.

I tried it again with just the ADB interface, and it all worked smoothly, keyboard and mouse. Thanks!

I've tried several different Macs now with all the PS/2 devices I have, pre-ADB and ADB, and aside from the occasional problems already mentioned it works great. I give it my official QA sign-off! Let me know if there's anything else specific you'd like me to test.