Keep Your Computer Awake
Found a great little utility today on Lifehacker. This Mac utility just keeps your computer from going to sleep, dimming the screen, starting the screen saver, etc. Useful for when your showing pictures or non-full screen movies and such.
This reminds me, lifehacker also had a link to another mac utility that lets you combine multiple PDFs into one. Sure you could do this with Adobe bloatware, but if you like avoiding crappy products, then this might be a simple, better alternative.