Just upgraded my Lotus Notes / Domino certification to 8.5 and believe me this one is the easiest of the lot (R6/6.5, 7, 8)
The purpose behind accepting to impart a training ND8.5 served its purpose and what I read during that came handy.
I consultated followings:
0.) My training material which I prepared for imparting the training.
1.) Notes / Domino Infocenter --> http://publib.boulder.ibm.com/infocenter/domhelp/v8r0/index.jsp
2.) Notes / Domino Wiki --> http://www-10.lotus.com/ldd/dominowiki.nsf/
3.) Notes/Domino 8.5 Reviewer's Guide --> http://www.ibm.com/developerworks/lotus/documentation/d-ls-ndreviewersguide/
Following are the topics one need to cover:
4.) ID Vault
5.) Shared Login
6.) Dynamic Policies
7.) Widget catalog, console log mirroring, server commands for traveler, daos, id vaults, router optimization, adminP new statics.