Couple of (pretty specific) presentation tips.

Use A Desktop Manager

I've started doing this and it's working pretty well for me. In some places you might be lucky enough to have both a "Slide" and a "Demo" machine (or maybe more than 1 demo machine) but, generally, I find that if I'm out doing a talk then I'm just running from my laptop.

To give the "multi-machine experience" I've started using Yodm3D to manage 4 desktops and then I can just have PowerPoint on one desktop and up to 3 sets of different demo bits available on the other 3 desktops and I can just flick between them.

Works really well for me.

Expression Blend and Design

Expression Blend is a great tool but it's a pig to demonstrate at 1024x768 because you really need more space to show it.

I find that at 1024x768 if you drop the global workspace zoom (it's on the Options menu since they moved it from the main UI) to about 65% then it's a lot easier to show things.

(The same thing works well in Expression Design)