Crazy pace of decreasing per GB cost of hard-disk data storage

At the year 2000, the cost of hard-disk storage was ~$20 per GB. A quick calculation gives that a TeraByte disk that we can purchase for ~$100 nowadays would cost ~$20,000 about 10 years ago. Isn't this mind blowing?
See http://www.alts.net/ns1625/winchest.html for the hard-drive prices by year.

A "must read" book on sustainable energy.

Sustainable Energy - without the hot air by David MacKay

Developed countries heavily rely on fossil fuels as an energy source which are expected to be consumed up in 50 years or so. Additionally, fossil fuels are the main cause of global warming as you might already know. In the not too distant future, we have to get off the fossil fuels. Well, how can we do that without compromising in our living-quality? David MacKay gives a quite coherent answer to this question in his book where he processes and summarizes immense amount of information on the energy subject. A striking feature of this book is that it is accessible for the average Joe.
This book is available online for free at: http://www.withouthotair.com/

here is a guest blogger from wordpress: QuantumBee writes on quantum entanglement

Quantum entanglement is one of the hot topics of modern physics. QuantumBee gives a brief account of this topic which is accessible for the average Joe.
http://quantumbee.wordpress.com/

next "wave" on internet music: GrooveShark

It is literally possible to stream every song on earth to your computer via "www.grooveshark.com". Note that this website is legal, and currently has agreements with big music companies. I guess they are planning to make money via ads displayed on the website or you pay < $10 to avoid these.

How to create a foiltex pdf presentation?

STEPS
1. Include the following lines in the main tex file:

\documentclass[landscape,dvips]{foils}
\usepackage{graphicx} % This may not be necessary
\usepackage[pdftex]{geometry}
\geometry{headsep=2.0em,hscale=0.80}

2. compile the *.tex file with the latex command:
latex filename.tex
3. view the file with xdvi:
xdvi -paper a4r filename.dvi

4. convert the dvi file to pdf:
dvipdf filename.dvi