How do i uninstall rpms or source code which i have just installed?

For most packages, uninstalling rpm's;

rpm -e (name-of-package-to-uninstall) minus the .rpm extension.

For source code packages, cd into the package's gunziped directory and type;

make clean (enter key)
make distclean (enter key)
make uninstall (enter key)

Of course, consult the readme or install file for specific instructions for the source package to make sure that there are not special instructions for the package.

Most rpm based distros also have an uninstall utility in the media control panel, or under configure computer--->configure-->package management...that allows you to search for and uninstall an application.
[Edited by danleff on 2004-06-13 06:31:36]