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With KDE 4.5 I am really enjoying activities.

Currently there are 4 activity types in KDE
- Desktop
- Folder view
- Newspaper
- Search and Launch

Search and Launch activity type is wonderful for my 10" netbook.

For netbooks, there are some alternate user interfaces like
- Android
- Gnome Shell
- Meego
- Unity

If KDE can have new activity types which will emulate the user interfaces of the above, it will be really exciting!

Someone is already working on a Cell Phone/MID/Tablet interface that has many similarities to smartphone interfaces.

Looking at the unity interface, as best as I can tell there are really only 4 things that KDE cannot do presently. One, the search and launch containment would need to have collapsible categories. Second, you would need to have buttons that you can put in a panel to trigger parts of the search and launch containment. Third, the panel would have to scroll if it got too full. Otherwise it is just a dock-style task manager (which will be supported in KDE 4.6), a global menu bar (same), a button to trigger the pager (probably easy to do), and the search and launch containment in the dashboard (possible in 4.5).

The gnome shell is a bit more difficult. It would require a panel that is only visible in when displaying, it would require an icon-mode lancelot shelf module, and it would require multiple rows for the other lancelot shelf plugins. However, it is nothing fundamentally impossible