I dropped in the required Javascript earlier today to enable Google Adsense. A bit of poking around tells me that there is quite a bit of tuning to be done to maximize things.
My first thoughts are not so great - the ads took hours to show up and when they did, they are all for garage doors! (probably taken from my URL http://www.davehodson.com/garage/) I'll be monitoring this closely over the next few days to see if the ads become more contextual based on the actual content in my blog.