Mail from Preston:

for the mozilla RPMs .desktop files, you should put %u after the path to 
the mozilla binary, so it can take a URL as a startup argument.  I made 
this change for Howard, and then Mozilla integrated much more seamlessly 
into KDE.  You can even use the File Types editor to move mozilla up the 
"importance" chain as far as HTML association goes, so then you are able 
to hit Alt-F2 (run dialog) type in a URL, and mozilla, not konqueror, 
comes up.  Very neato.