well, I wasnt thinking to use the actual Maemo interface or an actual model but to use the platform (hardware+os). It could be braindead simple to create a custom front end and make controllable with a bluetooth (already there and os supported) or IR remote (maemo is so flexible that could use existent remote controls instead of programming the remotes ). Just add a solid state hard drive and could be an ultra low power ultra slim module.
@benny1967: I understand your point, that's why I put that boxee link: they plane to land their XBMC based clone on a settopbox to access all the internet contents all around.
Nokia could make his own settopbox just to push their own contents and services to integrate with cellphones and future tablets just as Apple people do with all their devices.
Nokia already have an history of set top boxes and satellite receivers so to me seem really advantaged in the field (I think there was something in late 90's with a sort of Amiga software on...)
[EDIT]: I found the (amigapowered?) old nokia set top box