Presentation tip

At least act prepared. I echo the thoughts on this post from Jason that it shows the height of disrespect to your audience to inform them that you didn't really plan or prepare for your presentation.

And this has happened to me as well over the last while. 

You have to have something to bring them, otherwise don't even get up.

If you slides look like crap, don't use them.Most of the time they are overkill anyway.

Be prepared.