"rpm -i rpmname.rpm" would do it, although I use "rpm -Uvh rpmname.rpm" for both installation and upgrades of RPMS. I never use the "-i". Also you can install mutilple RPMS if you use wildcards in your RPM names, or more than one RPM on your command line. For instance. If you want to install all of the kde RPMS you would do something like:
rpm -Uvh kde*
but you may find that it will not install because it is dependent on some other package, just add the other package to the command line:
rpm -Uvh kde* arts*
And of course you can use any graphical KDE or Gnome RPM graphical tool in Gnome (gnorpm, kpackage, etc). And if you run konqueror as a file manager when you click on an RPM it will bring up the package manager. I think Gnome's file manager also does this but I don't have Gnome installed on the machine I'm working on. I prefer the command line for most everything though so maybe the other GUI types can suggest something for you.
[ March 10, 2002: Message edited by: VoidMain ]