How to install the ATI/AMD fglrx video drivers is one of the first questions many users have when they start up a new distro. The easiest option is an install from the distro's package manager; otherwise you have to manually download and compile from the ATI website.
Although they are evil proprietary binary code, without these drivers, 3d acceleration for games and desktop effects is usually missing or extremely poor performance. In some cases even the 2d performance is quite bad; so most users like to install them as soon as possible.
Traditionally (see SBD:ATI) on openSUSE a YaST/zypper repository has been available at http://www2.ati.com/suse/ (not viewable in a web browser). However in recent releases the ATI driver rpms in this repo have had bugs (originating in the original driver, not in the SUSE packaging); for some time the 64bit version installed files to 32bit locations and so failed to work; with the 11.3 release, the fglrx-10.7 rpms provided simply segfault on boot.
So with openSUSE 11.3 everyone had to fall back to the manual method. Some enterprising openSUSE users have written scripts and workarounds (,) that automate at least part of the process; but it still requires installing development tools (kernel-sources, gcc, etc.) on a non-development machine, which I especially dislike.
As it turns out the real source of the ATI rpms (and nVidia rpms BTW, but that's a topic for another day) normally available in the YaST repository is Stefan Dirsch's hard work in the X11:Drivers:Video OBS project. Since the drivers are non-free, the actual source code is not uploaded to the OBS, but it is made available in what as known as a "nosrc" format - including all the build instructions and patches, just missing the source package. Happily, this makes it possible for anyone to build their own video driver RPMs to exactly the same quality that would be available from the repo, and without having to install development packages.
Step by-step instructions are available in part 2 of this post.