Well, I've been investigating CMS's again and have found quite a few .Net ones lying around on the web.
FREE OPEN SOURCE
DotNetNuke

FREE SHARED SOURCE
AxCMS.Net

COMMERCIAL
Kentico (USD$500 per site)
Dozing Dogs (USD$249 per site)
ADXStudio
DigiMaker (couldn't find licensing on their site!)
SiteCore (USD$8,910 per site)
ContentXXL (EU4500)
QuantumArt

Basically found these by digging around blogs, Google and CMSMatrix.