yeah. the interface is kinda weird at first compared to the others, but once you figure out how most of it works, it's really a huge improvement. if you didn't already, i suggest playin around with PowerPoint. just fun to change the looks of the different cells.
What Mark is experiencing is due to the fact that Outlook 2007 now uses Word to render messages containing HTML+CSS, which means certain HTML elements and CSS properties are unsupported. Previous versions of Outlook used Trident (IE) as the rendering engine.
Because of this change, some HTML newsletters might end up looking different in Outlook 2007, but it doesn't affect all HTML messages, as many of you have noticed.