KDE pager is one of the biggest annoyances for people coming to KDE from AfterStep world. But the good news are here:
the pager has gained drag and drop, so you can move windows between desktops using it. in fact, you can drag from the taskbar to the pager as well. crazy cool. next will be to (optionally) show the desktop backgrounds.
The quote is from this post in the blog of Aaron J. Seigo, KDE developer.