The new dome is behind of and uphill of the old dome, looking at them from the angle of the pictures you posted.
Of your two pictures, you can see the new dome most clearly in the July 05 picture. It is the slightly lighter shape behind and above the old dome. The steam plume appears to be coming from the top of it.
The problem with seeing the new dome is one of contrast. Viewed from the angle of these pictures it's the same shade of black and grey as the slope behind it.
Here's a link to the USGS Mt. St. Helens website, with a picture explaining the various features inside the crater:
http://vulcan.wr.usgs.gov/Imgs/Jpg/MSH/MSH05/MSH05_crater_from_north_with_whaleback_views_annotated.jpg
This link takes you to the main Mt. Saint Helens web site:
http://vulcan.wr.usgs.gov/Volcanoes/MSH/Images/MSH/
My only point about the lack of apparent change is that at many hundred dump trucks full per day for a year, you'd ~think~ the change would be noticeable. That's the thing about the scale of it that's hard to grasp.
Thank you for the links and extra info.