I've themed them so that they display 336x280 Adsense blocks in the single posts at top and bottom and on the home page a 468x60 above the excerpts and 336x280 at the bottom. I've also put a link unit at the top of the sidebar.
I have 20 excerpts at a time on the main index page and 20 recent post links in the sidebar. There's also a categories list in the sidebar and an Amazon.com dynamic widget 160x600 banner.
Essentially what I'm going to do now is to put a version of every Unique Article Wizard article I've ever written onto each site. I've also installed the UAW plugin to auto-post other people's articles onto the site. The aim is to quickly build up a lot of 'semi' unique content without doing any manual posting and test how fast different sites - with and without PR - can get traffic and what kind of CTR/income they produce in the next 3 months.
The idea is that these sites are very quick and easy to set-up and maintain and because they are not new domains and/or have a little authority they should have the capacity to rank reasonably well for some of the low comp. keywords I've used in my UAW articles and for other long-tail keywords that inevitably get traffic with any large amount of content. It will take hardly any work on my part. I'll occasionally backlink any posts and keywords that get traffic.
I set the first one up yesterday (Welcome to ControlFreaks.tv) and it has 48 posts on it already. Some of those posts as well as some of the tags, pages and categories have already been indexed. I bought this a week ago for $9 from GD.
I hope to be able to work out a strategy for building a number of these sites over a year and share the technique with anyone looking for a way to get traffic easily. I expect the PR domains will work best, but things don't always work out the way they seem.
If anyone's interested in getting some updates let me know and I'll come back and post progress reports.