I've seen this book but not read it, looks like a good start for basic OOB stuff:
http://www.amazon.co.uk/Essential-SharePoint-2007-Administrators-Developers/dp/0596514077/ref=sr_1_4?ie=UTF8&s=books&qid=1244746506&sr=8-4
I've got this one, a really good read but a bit too basic as far as SP goes:
http://www.amazon.co.uk/SharePoint-Project-Management-Create-Information/dp/059652014X/ref=sr_1_1?ie=UTF8&s=books&qid=1244746489&sr=8-1
Fantastic for finding ways of building your own training resources to roll out though, you can pick up inspiration for how to deliver your training.
The most powerful OOB tool you're gonna use out of MOSS 2007 has to Business Data Catalogue though,
http://www.amazon.co.uk/s/ref=nb_ss_w_h_?url=search-alias%3Daps&field-keywords=MOSS+BDC&x=0&y=0
Written by someone who sounds familiar... ;)
(Apologies if half these links didn't work - Chrome does NOT like the text editor used here)