In the JBossPortalUserGuide.pdf document, section 2.3.1 it says to "Copy/Move jboss-portal.sar, portal-forums.ear, and your configured portal datasource file to $JBOSS_HOME/server/default/deploy". I have downloaded the jboss-portal-2.0.1RC1.zip and jboss-portal-2.0.zip files, and in both I find only a jboss-portal-sar directory, but not an actual sar file, and I can find no reference to portal-forums.ear.
Can someone tell me where to find these two files?
The portal forums is a separate download. You can find it on the JBoss Portal download page.
A SAR can be deployed in archived form (a file) or exploded (a directory). That's why there's no SAR file, so just copy the directory according to the instructions.