Here’s another one of those things that I discovered while being clumsy: in Firefox, click on your middle mouse button/wheel while hovering over a tab and it will close it; you don’t even need to click on the close icon. Evince, the PDF viewer favoured by Ubuntu, also makes use of the middle mouse button: for panning your way through documents using the hand tool. In a moment of lateral thinking, I tried the same trick with Adobe Reader and, in version 7.x, it works in the same way. On Windows at least, Adobe Reader 8.x is a different animal and features automatic scrolling, a very useful proposition for the reading of eBooks if the text doesn’t pass by you too quickly, and even a moderately reliable read aloud feature.