Technically, that would be a trojan, not a virus.

Hence the "quotes". Nowadays there are no real viruses in the original sense. So anything "malicious" gets to be named "virus". Even trojans are not really trojans anymore, as they usually get in unannounced (by definition a trojan should be _actively_ installed by the victim).

Nitdroid: is that a "virus" with presumably all the Google candy aboard?

Cross platform malicious programs does exist, but these days with the cross platform programming languages they still more or less heavily depend on either the target having the programming tools there or using something like scratchbox to compile the source code of the malicious program into something like a pure binary based that is ELF executable under linux.

I mean for instance, if lets say the virus was written in Java. Now N900 doesn't come with Java by default. So if a cross platform attack were to happen would only affect in this instance owners with java software installed such as icedtea6.

Then there's that option of simply compiling the source code into proper assembly executable such as python compiled. Though it still heavily depends on the source codes/dependencies and what not to be available at the time of compiling into pure machine code. So again the chances of that happening are somewhat unlikely but doable.