[ghaff]

Presentation Patterns, which a couple of people have mentioned, is probably more practical than most in terms of giving bite-sized advice though a lot of it is overkill (and not really even appropriate) for giving a manager a couple of slides about something.

The thing with most of the presentation books out there like Presentation Zen is that they're really oriented towards a good presenter up on a keynote stage at an event using slides as a supporting element of a well-rehearsed presentation.

That's not your typical presentation--and certainly not your typical internal monthly status meeting or project update.

Presentation Patterns also seems to do a better job than most at acknowledging the realities of material that's both presented and needs a leave behind. The "standard" advice is that you should have two separate documents but that's really not practical in a lot of circumstances.