There are no books on DataStage - though it would be good if IBM Press put one together.
There are some good tutorials showing up at
LeverageInformation
There are thousands of examples and tips in the archives of
www.dsxchange.com
There are some good tips on my two year old blog
Tooling Around on the IBM Information Server
There are a small number of articles here at Developerworks.
There is a good book that you can combine with DataStage exercises: The Data Warehouse ETL Toolkit - by Kimball and Caserta.
There is a DataStage tutorial in version 8 - see [url=http://blogs.ittoolbox.com/bi/websphere/archives/the-top-7-online-datastage-tutorials-15526]The Top 7 Online DataStage Tutorials[/url].
regards
Vincent
Message was edited by: vmcburney