Application that crashed: konqueror
Version of the application: 4.3.00 (KDE 4.3.0)
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
I use Konqueror as my file explorer. Both it and dolphin frequently crash, usually when I browse my home folder.

 -- Backtrace:
Application: Konqueror (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0xb7daa719 in QUrl::QUrl () from /usr/lib/libQtCore.so.4
#7  0xb7b44d89 in KUrl::KUrl () from /usr/lib/libkdecore.so.5
#8  0xb77ebaee in KFileItem::url () from /usr/lib/libkio.so.5
#9  0xb77dabbf in KDirModel::indexForItem () from /usr/lib/libkio.so.5
#10 0xb5bdcf62 in KFilePreviewGenerator::Private::orderItems () from /usr/lib/libkfile.so.4
#11 0xb5be0bc3 in KFilePreviewGenerator::Private::updateIcons () from /usr/lib/libkfile.so.4
#12 0xb5be0e38 in KFilePreviewGenerator::Private::delayedIconUpdate () from /usr/lib/libkfile.so.4
#13 0xb5be1ede in KFilePreviewGenerator::qt_metacall () from /usr/lib/libkfile.so.4
#14 0xb7e0c1b8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb7e0ce42 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb7e48687 in QTimer::timeout () from /usr/lib/libQtCore.so.4
#17 0xb7e125ce in QTimer::timerEvent () from /usr/lib/libQtCore.so.4
#18 0xb7e0716f in QObject::event () from /usr/lib/libQtCore.so.4
#19 0xb68b7d3c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#20 0xb68c003e in QApplication::notify () from /usr/lib/libQtGui.so.4
#21 0xb73c85cd in KApplication::notify () from /usr/lib/libkdeui.so.5
#22 0xb7df6bcb in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#23 0xb7e25d51 in ?? () from /usr/lib/libQtCore.so.4
#24 0xb7e223a0 in ?? () from /usr/lib/libQtCore.so.4
#25 0xb646ab88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#26 0xb646e0eb in ?? () from /usr/lib/libglib-2.0.so.0
#27 0xb646e268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#28 0xb7e222f8 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#29 0xb6959a75 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb7df51fa in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#31 0xb7df5642 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#32 0xb7df7ae9 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#33 0xb68b7bb7 in QApplication::exec () from /usr/lib/libQtGui.so.4
#34 0xb393f0c8 in kdemain () from /usr/lib/libkdeinit4_konqueror.so
#35 0x0804e27d in _start ()

Reported using DrKonqi