Thanks for all the thoughts guys.
The 'soil' is deep sand (about 80cm) over clay and in summer (like now) it gets bare in patches. When the wind blows I end up with it all in the house and the winery. The sand is quite water repellent - only winter rainfall will actually get into the soil as anything less than three days of rainfall just sits on the surface. It wicks away into the top layer, but scratch the surface 2cm down and it's bone dry underneath.
As for what I want to do: One part is to improve the soil around the house enough that the grass doesn't die off in summer so much, leading to the sand in the house problem. The other part is, well, a little less serious. I have a couple of small motorbike tracks on the property, which are great in winter when the sand is finally wet, but in summer it's so slippery and soft that it can result in close inspections of the vegetation if you know what I mean. Just driving through some of the paddocks is a job for the four wheel drive.
I've started mining the clay on site, but it's a slow process with the X495, c bit of clay and spread it in a test area to see how it goes. As for the grape skins, they've helped a bit around the house, but I haven't been able to mix them into the sand well enough. Oh, and don't even mention the drought we're in...