Why would you want to have Debian running on your N800/N810? Because it gives you access to countless applications and especially to OpenOffice, Gimp, Abiword and Firefox 3!
Read it here
Right after the install, youll have OpenOffice, Firefox3, Abiword and IceWM waiting for you in your Extras menu. To install more applications, launch Synaptic Package Manager then type and search for more (recommended: Gimp, Gedit, Kazehakase).