Version:            (using KDE KDE 3.5.6)
Installed from:    Gentoo Packages
Compiler:          gcc-Version 4.1.1 (Gentoo 4.1.1-r3) CFLAGS="-ggdb -O2 -march=nocona -msse3 -pipe -fomit-frame-pointer -fvar-tracking"
OS:                Linux

When submitting a comment to a typoshpere blog (http://farragut.flameeyes.is-a-geek.org/articles/2007/02/05/new-chapter-in-the-alsa-mess) Kontact/Akregator crashes.
Don't know, whether this happens with other blogs that use AJAX to display the comment immediately, too.
I hope the following backtrace helps you fixing the problem:

Backtrace:
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1241684304 (LWP 16252)]
[New Thread -1284531296 (LWP 16289)]
[New Thread -1276138592 (LWP 16288)]
[New Thread -1267745888 (LWP 16287)]
[New Thread -1259353184 (LWP 16286)]
[KCrash handler]
#9  KHTMLPart::slotFinished (this=0x893a6d8, job=0x9465ce0)
    at /usr/qt/3/include/qguardedptr.h:117
#10 0xb7945e02 in KHTMLPart::qt_invoke (this=0x893a6d8, _id=19, _o=0xbf835ea4)
    at khtml_part.moc:503
#11 0xb2e2d1cf in Akregator::Viewer::qt_invoke (this=0x893a6d8, _id=19, 
    _o=0xbf835ea4) at viewer.moc:201
#12 0xb2e3a9ad in Akregator::PageViewer::qt_invoke (this=0x893a6d8, _id=19, 
    _o=0xbf835ea4) at pageviewer.moc:183
#13 0xb677fe74 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#14 0xb73c9e03 in KIO::Job::result (this=0x9465ce0, t0=0x9465ce0)
    at jobclasses.moc:162
#15 0xb73cf0f8 in KIO::Job::emitResult (this=0x9465ce0) at job.cpp:235
#16 0xb73cf219 in KIO::SimpleJob::slotFinished (this=0x9465ce0) at job.cpp:601
#17 0xb73d6ddb in KIO::TransferJob::slotFinished (this=0x9465ce0)
    at job.cpp:971
#18 0xb73cdb3a in KIO::TransferJob::qt_invoke (this=0x9465ce0, _id=17, 
    _o=0xbf836168) at jobclasses.moc:1071
#19 0xb677ff0e in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#20 0xb6780a48 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#21 0xb73bde1c in KIO::SlaveInterface::finished (this=0x8ab5dc8)
    at slaveinterface.moc:226
#22 0xb73c015a in KIO::SlaveInterface::dispatch (this=0x8ab5dc8, _cmd=104, 
    rawdata=@0xbf836308) at slaveinterface.cpp:243
#23 0xb73bee0f in KIO::SlaveInterface::dispatch (this=0x8ab5dc8)
    at slaveinterface.cpp:173
#24 0xb73bbfd8 in KIO::Slave::gotInput (this=0x8ab5dc8) at slave.cpp:300
#25 0xb73bc147 in KIO::Slave::qt_invoke (this=0x8ab5dc8, _id=4, _o=0xbf836404)
    at slave.moc:113
#26 0xb677ff0e in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#27 0xb6780962 in QObject::activate_signal () from /usr/qt/3/lib/libqt-mt.so.3
#28 0xb6a92234 in QSocketNotifier::activated ()
   from /usr/qt/3/lib/libqt-mt.so.3
#29 0xb679bf11 in QSocketNotifier::event () from /usr/qt/3/lib/libqt-mt.so.3
#30 0xb6725225 in QApplication::internalNotify ()
   from /usr/qt/3/lib/libqt-mt.so.3
#31 0xb6725d82 in QApplication::notify () from /usr/qt/3/lib/libqt-mt.so.3
#32 0xb6d91908 in KApplication::notify (this=0xbf8368b8, receiver=0x8b4c4f0, 
    event=0xbf8366a8) at kapplication.cpp:550
#33 0xb671aa77 in QEventLoop::activateSocketNotifiers ()
   from /usr/qt/3/lib/libqt-mt.so.3
#34 0xb66d6da5 in QEventLoop::processEvents ()
   from /usr/qt/3/lib/libqt-mt.so.3
#35 0xb673abed in QEventLoop::enterLoop () from /usr/qt/3/lib/libqt-mt.so.3
#36 0xb673aa92 in QEventLoop::exec () from /usr/qt/3/lib/libqt-mt.so.3
#37 0xb6724d4b in QApplication::exec () from /usr/qt/3/lib/libqt-mt.so.3
#38 0x08058f62 in main (argc=158688232, argv=0xbf836ac4) at main.cpp:163
#39 0xb5ff0878 in __libc_start_main () from /lib/libc.so.6
#40 0x08058641 in _start ()