While the process of creating updates is generally pretty straight forward, having some specific samples to follow for the first few updates will give you the confidence to create your own. To that end, several specific updates are described.
If you have steps for additional updates, please edit this wiki to add them.
Wiki: Create_the_updates_you_want_to_install
Wiki: Creating_WSUS_updates_for_Adobe_Flash_(v10.1)
Wiki: Creating_WSUS_updates_for_Adobe_Reader_(v9.3)
Wiki: Creating_WSUS_updates_for_Firefox
Wiki: Creating_WSUS_updates_for_Java_(v6_–_21)
Wiki: Main_Page