This is intended to be a living resource of ISAM resources.  It will be update more in the future.

• 9.0.1.0 ISAM documentation

There’s also a few PDF’s that are fantastic (although the cookbooks in particular require a fair bit of time investment):

• ISAM Federations Cookbook
• ISAM for Mobile Cookbook
• ISAM Deployment Patterns

In addition to that – there are a few blogs from IBM folks that are probably worth putting into an RSS Feed:

• Shane Weeden:    (Shane posts sporadically, but posts deeply technical stuff about how to use the internals of ISAM/TFIM)
• Phil Nye:   (Phil posts more frequently, shorter articles directly addressing a technical problem)