For the past while, I have simply been using Gnome-shell on my HP Touchsmart laptop. The Gnome actually modeled a lot after Maemo5! Take a look at the developer logs. The only thing I see that it's missing is ease of getting the screen to rotate without some weird hacks. It would also be really cool if I could get an internal GPS in it.

Gnome-Shell still needs to add multitouch support a well, but then maemo5 never really had it either.

slaapliedje