its Good to start a separate thread for Cssu rotation...
i use shortcutd to enable and disable rotation with Cam key long press as toggle rotation...
as much as i know all Debbie command applications support rotation and are usable specially "Aqualung,Pcmanfm & Pcmanfm-Search"...
in maemo most of apps rotates and most of them are usable after that like sketch,angry-birds,micro-emulator,E-mail(compose gets Chopped tho),Conversation/Im(cant type coz no portrait keyboard same goes for Notes)...

i have a few suggestions

1)i guess we need a portrait keyboard now...

2) its a bit off topic but cant we make the "menu" icon permanently visible when in application menu "since it becomes difficult to find a blank space to click to navigate back to the Desk"

3) Also if full-desktop-rotation occurs in near future(i hope soon)... then please provide an option to get the complete-menubar(menu clock battery and all) at the bottom left as it would be easy to navigate to menu tasks and everywhere simply by "thumb"... and it would be Original for Maemo too, since in "Android" toolbar is center aligned and its battery clock and status area splits to the top...
this is what i mean..

N900 Portrait Mode Suggestion..



I hope CSSU make it possible... Soon...
All the Best...
thanks...