EDIT - I feel really stupid, turns out I used the wrong file for the brushes and there was only the one brush in there. I can't believe it took so long for someone to point it out after all the downloads of it. Anyway its fixed now so enjoy!
Here are the brushes I've made to speedpaint with. The few non techy ones are surprisingly good for painting landscapes. My favourate is ROCK 2 which can create an entire mountain range in the distance in one stroke
The preview image itself took about a minute to paint with them.
I've also included loads of mechanical junk type of brushes in the file which I have yet to actually paint anything with. Despite that, they are really fun to play with and by just messing with them you can create interesting shapes that should spark your imagination. They can also be used to make unusual textures and what not.
Remember you should be using these brushes with a graphics tablet of somekind but I'm sure if you haven't got one you could still improvise with them. Everyones free to use these as they like but it would be really nice if you'd show me what you've done with them. I'd especially like to see someone put them to better use than I can, as I'm sure many of you could do!