Application that crashed: dolphin
Version of the application: 1.3
KDE Version: 4.2.98 (KDE 4.2.98 (KDE 4.3 RC3))
Qt Version: 4.5.0
Operating System: Linux 2.6.28-14-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Dolphin crash after unmounting USB stick from the places sidebar. I have had this crash two times in a row. 

 -- Backtrace:
Application: Dolphin (dolphin), signal: Segmentation fault
[KCrash Handler]
#6  0xb6655459 in QUrl::QUrl () from /usr/lib/libQtCore.so.4
#7  0xb72c1d89 in KUrl::KUrl () from /usr/lib/libkdecore.so.5
#8  0xb7dafa5e in KFileItem::url () from /usr/lib/libkio.so.5
#9  0xb7d9eb2f in KDirModel::indexForItem () from /usr/lib/libkio.so.5
#10 0xb7c82f32 in KFilePreviewGenerator::Private::orderItems () from /usr/lib/libkfile.so.4
#11 0xb7c869b3 in KFilePreviewGenerator::Private::updateIcons () from /usr/lib/libkfile.so.4
#12 0xb7c86c28 in KFilePreviewGenerator::Private::delayedIconUpdate () from /usr/lib/libkfile.so.4
#13 0xb7c87b6e in KFilePreviewGenerator::qt_metacall () from /usr/lib/libkfile.so.4
#14 0xb66b7ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#15 0xb66b8932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#16 0xb66f3717 in QTimer::timeout () from /usr/lib/libQtCore.so.4
#17 0xb66bd6fe in QTimer::timerEvent () from /usr/lib/libQtCore.so.4
#18 0xb66b215f in QObject::event () from /usr/lib/libQtCore.so.4
#19 0xb68d9e9c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#20 0xb68e219e in QApplication::notify () from /usr/lib/libQtGui.so.4
#21 0xb76485cd in KApplication::notify () from /usr/lib/libkdeui.so.5
#22 0xb66a1a3b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#23 0xb66d0d71 in ?? () from /usr/lib/libQtCore.so.4
#24 0xb66cd4e0 in ?? () from /usr/lib/libQtCore.so.4
#25 0xb5e17b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#26 0xb5e1b0eb in ?? () from /usr/lib/libglib-2.0.so.0
#27 0xb5e1b268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#28 0xb66cd457 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#29 0xb697b365 in ?? () from /usr/lib/libQtGui.so.4
#30 0xb66a006a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#31 0xb66a04aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#32 0xb66a2959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#33 0xb68d9d17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#34 0x0807aa5f in _start ()

Reported using DrKonqi