Bugs:KDE
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KDE Bugreports
You may first want to check for an existing bug report at bugs.kde.org.
Crash backtraces should always get reported with installed -debuginfo packages. You can install them the moment you see dr. konqi come up - before you click in the "backtrace" tab, but you have to install them from the same installation medium you use (beta2 debuginfos do not fit to beta1 executables). Usually kdepim3-debuginfo, kdelibs3-debuginfo, kdebase3-debuginfo and qt3-debuginfo is all that is required though.
About the only useful logfile is $HOME/.xsession-errors - only for kdm/login issues there are some more, namely /var/log/messages, /var/log/kdm.log, /var/log/XFree86.0.log.
Debugging of kio_slaves (any problem with a protocol within konqueror for instance) is a bit more tricky. A description for this can be found here.
If you attach a gdb to a running process, remember that if the process has "[kdeinit]" in the name, the right executable is not e.g. dcopserver but kdeinit.

