Yep, it's not an application package - as I said, I'm having trouble building the .deb packages at the moment - I'm new to this whole process! You can't install it via the application manager.

Anyway, just unpack the archive to your home directory (you'll need bzip2 & tar) or download to a PC and unpack, then transfer to n800. Don't forget that the bochs executable can't run from the memory cards, as they're mounted noexec. Everything else can be on a memory card, but you'll have to adjust paths in the config file.

Hope that helps.