Good work as usual Gordon. I got a really good feeling for the camera, and I'm certain this will be helpful to many.
Reading reviews on other sites, you do feel that the A550 is a crappy camera but you not only back up your reviews with words and pictures, but also video, which just shows how much some of these guys exaggerate the negatives about the camera. Also, I think you got it right since the camera is missing a couple of things, but what it caters to, is people upgrading probably from a P&S camera, who are dumbstruck to find out that their new camera, which costs 3x as much as their old camera, can't even focus properly in live view
The comparison with the D90 was also very fair, and I don't think the Sony is better, but it does things differently enough that it will certainly appeal to some people who have different priorities.
In any case, I really like the direction Sony took with this model, and I hope they go on to refine the idea some more (improve the ergonomics, refine the menu system, improve the build). It does seem to have some rough edges, and maybe a little rushed in places (I felt the same way about the D90 as well with its video implementation), but there is some great technology that will help to grow the Alpha range in 2010.
N.B. You seem to know something about the new A7xx camera! Pop Photo also made some sly comments in their Jan. issue. I hope you already have a copy, and that your review will be one of the first out, because some of these reviews just don't give people a good idea about a new camera/lens.
In addition, Sony needs to send you a review copy of cameras a little quicker, as cameralabs does seem to lag behind in reviewing Sony gear as opposed to other review sites.