There are a number of jars that do not reside in the Ibiblio repository for various reasons:
hibernate-3.1.jar
connector.jar
activation.jar
mail.jar
servlet-2.3.jar
jta.jar

To populate your mvn repository do the following:

Unzip the extrajars.zip file to a directory
Change to the directory with the jars in it.
Run the following commands to populate your mvn repository
mvn install:install-file -DgroupId=hibernate -DartifactId=hibernate -Dversion=3.1  -Dpackaging=jar -Dfile=hibernate-3.1.jar
mvn install:install-file -DgroupId=javax.resource -DartifactId=connector -Dversion=1.0  -Dpackaging=jar -Dfile=connector-1.0.jar
mvn install:install-file -DgroupId=javax.activation -DartifactId=activation -Dversion=1.0.2  -Dpackaging=jar -Dfile=activation-1.0.2.jar
mvn install:install-file -DgroupId=javax.transaction -DartifactId=jta -Dversion=1.0.1B  -Dpackaging=jar -Dfile=transaction-1.0.1B.jar
mvn install:install-file -DgroupId=javax.mail -DartifactId=mail -Dversion=1.3.2  -Dpackaging=jar -Dfile=mail-1.3.2.jar
mvn install:install-file -DgroupId=servletapi -DartifactId=servlet-api -Dversion=2.3  -Dpackaging=jar -Dfile=servlet-api-2.3.jar
mvn install:install-file -DgroupId=dwr -DartifactId=dwr -Dversion=1.0  -Dpackaging=jar -Dfile=dwr-1.0.jar
mvn install:install-file -DgroupId=urlrewrite -DartifactId=urlrewrite -Dversion=2.6.0  -Dpackaging=jar -Dfile=urlrewrite-2.6.0.jar