So a brief perusal of the spreadsheet linked above shows that maemo running (legally) on 3rd party hardware would be missing quite a few things that are included in OS2008:
- microb web browser
- image viewer
- media player
- notes application
- sketch application
- contacts application
- most of the control panel
- most of the status bar applets
- most of the desktop applets
- most of the themes
- various system dialogs and notifications
- others likely, this is just a short list.
Also remember that the following are closed source and likely legally tied to the Nokia tablets as well:
- skype
- gizmo
- flash

At that point you have to ask yourself whether you're better off spending time filling in those gaps with open source stuff or just bringing over your favorite maemo apps to another desktop.

-John