Follow the instructions at the link below to install KDE 4 for Ubuntu:
http://kubuntu.org/announcements/kde-4.0.php
Screenshots follow! Image may be NSFW.
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KDE 4’s Show Desktop Grid, use Ctrl-F8:
Image may be NSFW.
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Pick running app, use Ctrl-F10
Image may be NSFW.
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If you want some more screenshots let me know.
Update: To install extra goodies do the following:
sudo aptitude install kde4
