in order for a program to be able to run on N900, it needs to be compiled for it's processor. So unfortunately you can't take a binary which was compiled for X86 and run it on N900. But most Linux programs can be recompiled onto N900 with minimal changes. To do that, you'd need to install a scratchbox on a desktop which can recompile onto the N900 processor. See the development tab of this site for details.