So I have spent a couple of hours this evening putting together some wireframes...
I started with pen and paper
|A very quick scribble|
So I thought I'd see what I could find for free. Typing "wireframe tool" into google found me wireframe.cc I played with this for about 10 minutes before I gave up on it. I just couldn't get it to do things like adding text, so I looked for something else.
Here I found moqups.com I really liked this, it was intuitive, easy to use and I managed to put together something that I'm quite pleased with.
Here's a link to the wireframes in their current state:
If you can see anything that you think really won't work (or an obvious improvement) please shout below.