If you’re in the business of writing and delivering presentations and you think that there might be people out there interested in seeing them, I heartily recommend SlideShare.
It’s simple – make an account, fill out your profile, then upload presentations as PowerPoint files or PDFs. Then they’re viewable in your browser using their flash widget. You can restrict who has access to slides, or make them public. There’s even a full screen presentation mode; in principle, you could substitute it for actually hauling copies of your presentations around with you – just bring them up in the browser..
Anyway, I’ve chucked up a bunch of old presentations from my Masters. Later I’ll upload some more recent works including the lecture slides for Educ122. All available at http://www.slideshare.net/xorgnz