Alright, so I decided to write up a short intro to RF. Its got the basics of electromagnetic waves, including definitions like wavelenght, frequency and so on. It goes on to describe a few basic digital modulation techniques, how they work and what they're used for. Finally, it goes on about sampling and why we need I/Q sampling and what it actually is.
Hope its helpful to someone out there!
http://www.mediafire.com/view/yza84fmazflonl0/rf.pdf
I quite like writing up tutorials, so if anyone's got any other ideas or requests they'd like in a tutorial like this, comment what you think! It can be more technical, practical or even theoretical if people prefer!
Let me know what you all think!