AJA released all new drivers for FCP 7 shortly after it was released. Kona 3's are playing very nicely with FCP 7 here.
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As Walter has pointed out, Kona 6.5 has been out for FCP 7 for a bit now. Doing some minor testing this morning and this past weekend, Kona 6.5 software for my LHe is working well with NTSC video and FCP 7.0 under Snow Leopard.
Like I said, "minor testing" so do not take this as gospel.