What would you change? I've only used a PIM on my Zaurus. I'm still using a normal agenda. But because I lack experience with PIM I don't know how a good PIM would work or look. I do know the current solutions each have quirks. Maybe a mockup would be useful, or even having contact with the developers. Don't forget there used to be KDE PIM/PI for Qtopia's Zaurus. That was KDE2, and years ago, but still. If you go to http://pim.kde.org you basically are redirected to http://kontact.kde.org and all the information on the homepage is old. It looks like KDE PIM hasn't reborn yet. Because Nokia goes Qt, KDE PIM might be a very useful addition.