The problem is sp-auth as it's closed source and only available for the x86 architecture. At least I wasn't able to find a source looking on the web.

Other than that sopcast-player and gtk-sopcast, could be compiled for the N900. But sp-auth isn't gonna run unless recompiled for armel...

Unless you find the source somewhere, which doesn't look possible, as it seems to be some shady Chinese programming, no luck...