Suggest starting with the SAS-hosted documentation at SAS support http://support.sas.com website, along with additional technical / conference material on the site as well.
Scott Barry
SBBWorks, Inc.
Suggested Google advanced search argument, this topic / post:
cluster analysis site:sas.com
ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.