It happened a for a second time today. In this instance X had completly frozen so I had to restart it. Upon restart the rest was identical (for me) as to what happened before. I have no idea is this backtrace is any different but in any event.....

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1233254176 (LWP 22053)]
[KCrash handler]
#6  0x00000000 in ?? ()
#7  0xb571e275 in KonqKfmIconView::doOpenURL (this=0x86344f0, url=@0xbf8435dc)
    at /build/buildd/kdebase-3.5.7/./konqueror/iconview/konq_iconview.cc:1303
#8  0xb67629ee in KonqDirPart::openURL (this=0x86344f0, url=@0xbf8435dc)
    at /build/buildd/kdebase-3.5.7/./libkonq/konq_dirpart.cc:646
#9  0xb6595996 in KonqView::openURL (this=0x8625cc8, url=@0xbf8435dc, 
    locationBarURL=@0xbf843668, nameFilter=@0xbf8437b8, tempFile=false)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_view.cc:223
#10 0xb65a0195 in KonqMainWindow::openView (this=0x8125ef0, 
    serviceType=@0xbf843978, _url=@0xbf8437f4, childView=0x8625cc8, 
    req=@0xbf8437b4)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_mainwindow.cc:891
#11 0xb65af5e6 in KonqViewManager::loadItem (this=0x8178810, cfg=@0x80fa648, 
    parent=0x8384574, name=@0x8366818, defaultURL=@0xbf843dbc, openURL=true, 
    openAfterCurrentPage=false)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_viewmgr.cc:1563
#12 0xb65af1fe in KonqViewManager::loadItem (this=0x8178810, cfg=@0x80fa648, 
    parent=0x8125fa4, name=@0xbf843e4c, defaultURL=@0xbf843dbc, openURL=true, 
    openAfterCurrentPage=false)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_viewmgr.cc:1640
#13 0xb65b0c76 in KonqViewManager::loadViewProfile (this=0x8178810, 
    cfg=@0x80fa648, filename=@0xb76c1688, forcedURL=@0xbf843f34, 
    req=@0xbf843ef4, resetWindow=false, openURL=true)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_viewmgr.cc:1212
#14 0xb65b1abe in KonqMainWindow::readProperties (this=0x8125ef0, 
    config=0x80fa648)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_mainwindow.cc:4913
#15 0xb6cce574 in KMainWindow::readPropertiesInternal (this=0x8125ef0, 
    config=0x80fa648, number=1)
    at /build/buildd/kdelibs-3.5.7/./kdeui/kmainwindow.cpp:825
#16 0xb6cce6e3 in KMainWindow::restore (this=0x8125ef0, number=1, show=true)
    at /build/buildd/kdelibs-3.5.7/./kdeui/kmainwindow.cpp:416
#17 0xb65b8ccf in kdemain (argc=3, argv=0x8085158)
    at /build/buildd/kdebase-3.5.7/./konqueror/konq_main.cc:80
#18 0xb7f1d464 in kdeinitmain (argc=3, argv=0x8085158) at konqueror_dummy.cc:3
#19 0x0804e6bf in launch (argc=3, _name=0x8091acc "konqueror", 
    args=0x8091b16 "", cwd=0x0, envc=0, envs=0x8091b1b "", reset_env=false, 
    tty=0x0, avoid_loops=false, startup_id_str=0x805104e "0")
    at /build/buildd/kdelibs-3.5.7/./kinit/kinit.cpp:673
#20 0x0804ef4f in handle_launcher_request (sock=19)
    at /build/buildd/kdelibs-3.5.7/./kinit/kinit.cpp:1240
#21 0x0804f328 in handle_requests (waitForPid=0)
    at /build/buildd/kdelibs-3.5.7/./kinit/kinit.cpp:1443
#22 0x080505bc in main (argc=5, argv=0xbf844b84, envp=0xbf844b9c)
    at /build/buildd/kdelibs-3.5.7/./kinit/kinit.cpp:1909
#23 0xb7c70ebc in __libc_start_main () from /lib/tls/i686/cmov/libc.so.6
#24 0x0804bb51 in _start ()