Securely wipe hard disks
If you ever sold or bought a used hard disk you probably know about this already. For all others, even if you use delete and format to clear the hard disk before selling it there are possibilities to recover most and possibly all data that was once on the hard disk.
There have been numerous cases in the news where people bought used hard disk and found confidential files on them using tools to recover deleted data. Enter Darik's Boot and Nuke.
Guide to streamripping
Streamripping means saving mp3 files from internet radio streams to your hard drive. All you need is the right tool that does the work for you and your favorite radio station that broadcasts on the internet and uses a format supported.
This article will give you a tutorial on how to start streamripping and legally download all the latest mp3 files to your computer. I can´t speak for all countries though so you better check out if recording music from radio is legal in your country.