well probably its a threat to n9... Considering 2 large mobile OS combined into 1 superphone what else would you want? N900 can be overclocked to (i'm not sure thou correct me if i'm wrong)1.2ghz maximum and its almost close to the upcoming snapdragon 1.5ghz
the only weak point for n900 as i can see is the not so important lack of magnetometer and of course it's screen which is prone to scratches. And... Nokia support hehe