There seem to be issues with the (at least for some newly working) flash support in Konqueror
Blauzahl mentioned she can use flash. Indeed I did! flash 9.0.115 on a 32bit compiled system
For me (mutlu_inek) flash also works with minor crashes from time to time, it does automatically restart, though, so no problem. I am using self-compiled trunk, rev. 798847, and adobe's flashplugin 9.0.124 on Arch Linux.
Test site #1:
Sahaqiel -If I close the tab after hovering the second ad counting from the right, nspluginviewer will crash. And besides, the ad will expand leaving a blank spot with the size the ad occupied.
mutlu_inek - The site looks nearly exactly like in Firefox. Only flash boxes that resize themselves are not displayed correctly, they claim the space they use when they are full-sized by displaying a white box over the other flash content. Nspluginviewer crashes when browsing away from the site.