This is a Walkthrough for adding Extra repositories to a stock openSUSE 11.3
Caveat Emptor: If you bork your computer whilst following this, it's not my fault.
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The Repos I would recommend as a minimum are:
openSUSE BuildService - Mozilla
openSUSE BuildService - OpenOffice.org
Packman
VideoLAN
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Start
System >> YaST - You will need to enter the root password
Click on
Software Repositories
After some loading screens you should see the following:

Click on
AddYou should then see:

Click on
Community Repositories >>
NextYou should then see a list of Repos. Tick the ones you want. Click
OK
If/When you see dialogue boxes as follows, just click
Yes,
Import or
OK

Eventually you should get an adding feedback:

Once this has wound through it all, you should be passed back to the now expanded Loaded Repository List:

Click
OK and you're done.