Sorry boring day at work (all day conference call) so you get to hear my thoughts.
First off I really like the skin, looking really nice! I haven't found a skin yet that really does all the things I want, so I've just recently starting taking a few swipes at some xml and graphics work myself. I don't have anything yet that I really want to put out there, however after becoming bit more familiar with the process I have a few questions/suggestions.
First the home page looks great, I like the clean look. I read your thread on XBMC too, and I agree with szsori on a few things about the home page. I like less text. (my HDTV broke, and rather than fix it I plan to buy a new one.....someday. As a result I am running on a 4:3, 36 inch TV, and most text is always hard to read, I know this won't support 4:3 yet but I often think the less text the better.) Keeping the names simple like Watch vidoes, or Listen to music. I think that might help with the clean look.
A question on the home page is, I have 5 catagories of video: Movies, TV Shows, Kids Shows, Snowboard Movies, Skateboard Movies. I don't expect you to add those, but my question is if I go in and start working on the XML to add them myself, how would you see that working, would the list scroll in the "video" box? would the box expand?
Other suggestions, the TV show view, once again I like szori's comment about possible wide banners on the right, I think they could look good in that space.
I really like the Fan Art views, and it looks as though you are setting it up so we can choose the fan art, which I think is awesome! Also in your screen shots you have the shows title in "logo" form and in text on the fan art views, I'm not sure if you are just mocking these up or if you are really pulling the show logo's from somewhere. (I've seen rumblings about that ability in the XBMC.org forums) If you are getting the logo's I would love to see the logo go over the fan art, and the text be removed.
Movies - I don't know what other views you will have, but would definitely like some kind of cover flow or something, I like to view my movies in some poster form, and if I really want to read the info on them, hit the info button. when simply browsing for movies, I really only want the poster, and maybe the title displayed.
The OSD - not a big fan of the PMIII one, but at the same time I haven't seen one a whole lot better yet either. I think my favorite OSD design so far is Vinci.
Well there you have it, couple of my suggestions, take them or leave em, either way your work is so far ahead of what I could do, and this skin is looking really close to giving me what I am looking for.