When you logout from KDE you will see a cute cartoon of a dragon in the logout window. It is called 
Konqi. After your 100th logout Konqi will no longer be cute. The dragon cartoon is stored in a PNG file called shutdownkonq.png which can be overwritten with anything you like. (Pictures with transparent backgrounds will look the best.) This file is found in the directory /usr/X11R6/share/apps/ksmserver/pics/ on RedHat, /usr/share/apps/ksmserver/pics/ on Mandrake and in /opt/kde3/share/apps/ksmserver/pics/ on SuSE.
(I almost forgot: IsomerMadeMeDoThis.)
By default, KDE will open web links using konquerer. There's nothing in the GUI config that will let you change this, nor is there any help in kde.org's own FAQ's or mailing lists, and a google search turns up many people asking how with very few functional replies. Usually they suggest changing the MIME associations for text/html, which only changes how KDE opens html documents when they're sitting on your desktop.
So, after almost six hours of googling, asking on IRC, and generally making a pest of myself I finally found out that under debian at least it is trivially easy; just set the BROWSER environment variable to point to the browser you want.
This doesn't appear to actually be documented anywehre that google knows about, so hopefully mentioning it on the WIKI will help a few people.
ANOTHER way of doing this is to make/edit the file /.kde/share/config/kfmclientrc as follows:
