Umbraco - The Friendly CMS:

Who would believe that there would be an open source CMS based on Microsoft's ASP.NET? A CMS that can support any modern browser and that even allows editing with Microsoft Word. One where designers can create accessible and valid xhtml with their markup left intact. Where developers can integrate any .net based control right out of the box. If someone tells you "wont' happen", then they have never used umbraco..

Well I haven't done 1/2 of that yet, but I'm only a day in and already seeing progress on implementing a design given to me without knowing the platform ahead of time, and I can say I like what I see so far. I'm going to have to learn a few new skills (XSLT, XPath, etc.) but this is CMS done right, and you can't beat the price.

Props to Fire Pig Partners.