To get the name of a unique page in portal's dynamic contents such as navigation.jsp, use the following code.
${node.objectID.uniqueName}
${node.objectID.uniqueName}
It is possible to access Page Parameters from Portal Theme using
<portal-logic:pageMetaData> tag
<portal-logic:pageMetaData varname="pageMetaData">
<c:forEach var="metaItem" items="${pageMetaData}">
${metaItem.key} <!-- Gives Page Parameter Key -->
${metaItem.value} <!-- Gives Page Parameter Value -->
</c:forEach>
</portal-logic:pageMetaData>