Not liking those previous answers... I mean,
WWGD? Provide better answers, that's what.
Summary: For fonts, choose "Save As...", then select "Save Options..." from the Tools menu in the save window that opens up. Then choose to embed fonts.
Also check out File > Package for CD.... You can choose to embed fonts, and it'll automatically bring along all linked files. Note quite embedding, but most professors I've met aren't opposed to having people run a presentation off a CD. Or you can run a packaged PowerPoint presentation off a USB key, even.
Hope that helps.
