This software – Posterous – is useful if you wish to put a presentation online quickly and easily. You can email pictures, text, powerpoint presentations – indeed anything – to the Posterous website and it is automatically posted for you on a blogsite.
As an example I attach two recent Powerpoint presentations I gave – one on climate change policies and the other an introduction to microeconomics.
The website to open an account – it takes only a few minutes and is currently free – is here. You seem to be able to open as many sites as you like.