One of your screenshots has a sample 3-column template. At the bottom it says that this can be easily created by just setting the RepeatColumns property of the dataset. Would you elaborate on that? How is this done?

If you can wait a couple days, a three-columns and a two-column template will be included in version 4.1 which I plan to release very soon.

To add this to you're own template, you simply need to add to additional parameters to the datalist tag, RepeatColumns="3" RepeatDirection="Horizontal".

So, the datalist declaration would look something like:
<asp:DataList id="lstArticles" CssClass="ArticleList" RepeatColumns="3" RepeatDirection="Horizontal" ItemStyle-CssClass="threeColumn" runat="server" OnItemDataBound="Item_Bound" EnableViewState="false" CellSpacing="4" CellPadding="4" Width="100%">