IBM's open source strategy is pretty simple when you come right down to it.
Linux, and open source, will unite IBM's past with computing's future.
That sounds like it was written by someone in IBM marketing, but it's easy to explain with one story "ripped from the headlines" over at News.Com.
Here's the rest of the story. Cloudscape is the server for DB2, IBM's old database format. By working with Zend, DB2 users get professional tools that will let not only let them migrate their oldest databases to the Web, but provide quick user interfaces for desktop tools based on those databases.
DB2 users might want to check out IBM's technical roadmap for this transition. If you're an enterprise customer, with a long computing history, this looks like very good news indeed.