Just installed ReSharper 3 on VS2005 andd VS2008 and I'm seeing the same problem on both.
In my ASPX page I have a control (a GridView called eventsView) which I reference in the code behind. In the code behind ReSharper recognizes the control, so that the name eventView is not 'hightlighted' but I can get any intellisense for the control and I any methods/properties I use on the control are highlighted.
This is with ReSharper 3.0.2.
Sorry if this is a FAQ but I couldn't find anything on it,