Don't know much about Agile myself but I know a lot of the IT job ads on seek ask for it among the skills.
This is an "IBM version", but I'm not sure exactly what that means. It is 74 pages and ten chapters long (i.e. not just a sample chapter) and has one case study on how IBM used Agile themselves.
http://whitepapers.theregister.co.uk/paper/view/2564/agile-f…
If that interests you, you might also like to check out another Agile related "whitepaper" on theregister.co.uk;
http://whitepapers.theregister.co.uk/paper/view/2563/a-pract…
Here are several more on theregister site;
Desktop Virtualization for Dummies
http://whitepapers.theregister.co.uk/paper/view/1859/
WAN Optimization for Dummies
http://whitepapers.theregister.co.uk/paper/view/1796/bluecoa…
Application Performance Monitoring for Dummies
http://whitepapers.theregister.co.uk/paper/view/2132/
IT Policy Compliance for Dummies
http://whitepapers.theregister.co.uk/paper/view/1462/qualys-…
Virtualization for Dummies
http://whitepapers.theregister.co.uk/paper/view/1265/dummies…
Bruce's TL;DR guide to Agile as practised in almost all workplaces:
Agile is what you call your process when you don't have any process.
Disclaimer: I know this isn't actually agile, but I've not seen agile actually being used in the work place.