It's interesting that flash doesn't work for you in Konqueror.
What are the symptoms?
Are you using AMD64? If so, are you using the 64-bit plugin? Also do you have konqueror-nsplugins installed, and are you using gtk-qt-engine? I know that the KDE3 version of gtk-qt-engine causes Flash to crash in KDE4, which I assumed was due to version incompatibilities, but it's possible that it just doesn't work with Flash in Konqueror at all.