Since it's my first post, I SAY HELLO EVERYONE

I'm using Kde4.2 (wxWidgets 2.8.10) and the icon in the systray is NOT transparent at all: it shows a white background. I think it's not a Qt/NVidia/KDE problem since all other icons are transparent. I also saw that you closed a thread about opening aMule with just one click, but I'm using KDE and it would really be a great choice because I can restore Nepomuk, Kopete, KMix, Wicd, KWallet, Amarok, ... with a SINGLE click. So I think it would be better

for integration
Also, since I use KDE, I'd really appreciate an aMule plasmoid like the one we have for torrents. You could ship it as a separate applications since it requires libplasma (maybe on kde-apps.org)
Best regards