Lots of good resources, starting MSDN:
Brent Ozar:
http://www.brentozar.com/sql/table-partitioning-resources/
MS SQL Tips:
http://www.mssqltips.com/sqlservertip/2888/how-to-partition-an-existing-sql-server-table/
Mark Chapple:
http://databases.about.com/od/sqlserver/a/partitioning.htm
MSDN Blogs:
http://blogs.msdn.com/b/manisblog/archive/2009/01/18/easy-table-partitions-with-sql-server-2008.aspx
...and many, many more!