Version:           1.0.99 (using 4.00.80 (KDE 4.0.80 >= (KDE 4.1 Beta1), Debian packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.24-1-686

I do not know how to reproduce this bug with a 100% chance of a crash, but after looking a different places ("Home", "Root", "Trash", etc) clicking on "Preview" under "Network", sometime causes Dolphin to crash. I added a backtrace:

Application: Dolphin (dolphin), signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0xb5e92720 (LWP 15575)]
[KCrash handler]
#6  0x08708d89 in ?? ()
#7  0xb7730202 in qDeleteAll<QList<KJob*>::const_iterator> (
    begin=@0xbfbd46d8, end=@0xbfbd46dc)
    at /usr/include/qt4/QtCore/qalgorithms.h:352
#8  0xb77300fe in ~KCompositeJobPrivate (this=0x8396d98)
    at /usr/include/qt4/QtCore/qalgorithms.h:360
#9  0xb7cb56d6 in ~FileCopyJobPrivate (this=0x8396d98)
    at /tmp/buildd/kde4libs-4.0.80/kio/kio/job_p.h:35
#10 0xb7730b94 in ~KJob (this=0x83971e0)
    at /tmp/buildd/kde4libs-4.0.80/kdecore/jobs/kjob.cpp:69
#11 0xb772fcf8 in ~KCompositeJob (this=0x83971e0)
    at /tmp/buildd/kde4libs-4.0.80/kdecore/jobs/kcompositejob.cpp:44
#12 0xb7ca0558 in ~Job (this=0x83971e0)
    at /tmp/buildd/kde4libs-4.0.80/kio/kio/job.cpp:97
#13 0xb7ca058d in ~FileCopyJob (this=0x83971e0)
    at /tmp/buildd/kde4libs-4.0.80/kio/kio/job.cpp:1791
#14 0xb757a06c in qDeleteInEventHandler (o=0x8708d88)
    at kernel/qobject.cpp:3595
#15 0xb757bfdc in QObject::event (this=0x83971e0, e=0x86ad9f8)
    at kernel/qobject.cpp:1124
#16 0xb6c78bac in QApplicationPrivate::notify_helper (this=0x80b7498,
    receiver=0x83971e0, e=0x86ad9f8) at kernel/qapplication.cpp:3772
#17 0xb6c7d739 in QApplication::notify (this=0xbfbd4ea4, receiver=0x83971e0,
    e=0x86ad9f8) at kernel/qapplication.cpp:3366
#18 0xb7a5c7fd in KApplication::notify (this=0xbfbd4ea4, receiver=0x83971e0,
    event=0x86ad9f8)
    at /tmp/buildd/kde4libs-4.0.80/kdeui/kernel/kapplication.cpp:311
#19 0xb756b899 in QCoreApplication::notifyInternal (this=0xbfbd4ea4,
    receiver=0x83971e0, event=0x86ad9f8) at kernel/qcoreapplication.cpp:587
#20 0xb756cc49 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0,
    event_type=0, data=0x80a7758)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#21 0xb756ce6d in QCoreApplication::sendPostedEvents (receiver=0x0,
    event_type=0) at kernel/qcoreapplication.cpp:1091
#22 0xb7596caf in postEventSourceDispatch (s=0x80b9190)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#23 0xb6210978 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0xb6213bce in ?? () from /usr/lib/libglib-2.0.so.0
#25 0x080b9108 in ?? ()
#26 0x00000000 in ?? ()
#0  0xffffe410 in __kernel_vsyscall ()