HtmlTextBlock is a control I wrote way back in 2007 to enable the display of simple HTML markup by the Silverlight (1.1 Alpha!) platform without needing to translate it to XAML first. HtmlTextBlock was intended more as a proof-of-concept than anything else, but it seems to have satisfied a fairly common customer need and I've heard from lots of customers who are using it! But my last update was in 2008 and I'd kind of forgotten about this project since then...
Until - out of the blue - Morten Nielsen (@SharpGIS) contacted me a few days ago to let me know about an update he'd done to HtmlTextBlock to use Silverlight 4's Go to the complete details ...