DB2
IBM Ressources:
IBM Data Management Homepage
This is a good starting point with links to all IBMs DM software.
IBM DB2 UDB Homepage - DB2 on Workstation Platforms
DB2 DeveloperWorks - my favorite site for technical documents
Education:
LIS.TEC - Classes from the professional IBM Business Partner
DB2 Education - Books, Online classes, Classes worldwide,...
DB2 Education in Germany - detailed course listing with locations and dates
BI and DW Education in Germany - same as above just for BI and DW
Books and Whitepapers:
DB2 Administration - The best DB2 book (german) - I am one of the authors!
DB2 UDB Manuals - online and for download
There are packed HTML versions available for download as well as in PDF format. You can also view them online. The books are separated by version so it is easy to look up functions and to compare things between versions.
Whitepapers - IBM Whitepapers
Redbooks - additional publications can be downloaded for free
Really recommended - not just for DB2.
Download:
DB2 download - free versions + Try&Buy packages
DB2 Fixpacks and Clients download
Additional Ressources:
DB2 UDB Support - Tipps&Tricks, FAQs, ...
DB2 UDB APARs
NON IBM DB2 Ressources:
DB2 Magazine - register and get it for free
SQL Cookbook - one of the best SQL books I know - and it is FREE!
Poor Man's Flight
A table editing tool - imitated "Visual Flight" which came with DB2 V2.
Rubans DB2 Site (german)