This IBM i Redbook covers external stored procedures and triggers, external UDFs, Java procedures, and more.
In this blog post, Db2 expert Kent Milligan reviews key items for a successful Db2 SMP implementation.
This IBM Redbooks publication provides a broad understanding of what can be done with the DB2 Web Query product.
Frequently Asked Questions for Db2 Web Query.
This IBM Support web site is a great starting point for Db2 for i. It provides an introduction to Db2 for i and has many links to additional information.