Is there a control in WP7, other than a WebBrowser, which can display basic HTML (a few <p>s, <b>s, <i>s, <div>s and <span>s) inline?
I cannot use a WebBrowser for my app because I need the control to live inside a pivot (i.e. not swallow any gestures), and to keep the background of the rest of the pivot.
If it's basic markup you can always transform the HTML with the help of the HTML Agility Pack to a RichTextBox. (See: http://debugmode.net/2011/06/02/richtextbox-in-windows-phone-7-1-or-mango/)