I just downloaded the 3.0 ISO and it booted for me with just

boot cd:,\ofwboot.xcf

Thats on a Sawtooth.

Did you use binary mode to download the ISO and verify the checksums? 
Perhaps you didn't finalize the disc or something odd in your cd 
burning software?

Quoting "Dale Offret Jr." <maquaro@yahoo.com>:

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> Hash: SHA1
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>> Try:
>> - CAPITALIZED filenames
>> - filenames with ;1 appended
>> - any combination of the above.
>>
>
>> boot cd:,\OFWBOOT.XCF;1 NETBSD.MACPPC;1
>
> boot cd:,\ofwboot.xcf netbsd.macppc
> boot cd:,\ofwboot.xcf;1 netbsd.macppc;1
> boot cd:,\OFWBOOT.XCF NETBSD.MACPPC
> boot cd:,\OFWBOOT.XCF;1 NETBSD.MACPPC;1
>
> boot ide0/disk@0:,\OFWBOOT.XCF;1 NETBSD.MACPPC;1
>
> None work.  Still giving client program format error
>
> Dale
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> nG4bEaKT2tslU/W1rB9CYWU=
> =SnPy
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> !DSPAM:43b1e75f43875511194595!
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>
>