I'm not a massive poster on the forums as my post count will show but I am a regular visitor and I thought I would break the habit and post my thoughts. I may duplicate some things that others have said but I haven't had chance to read through all of the other pages of this thread.
Just for reference areas of the site that I view the most are -
Most Recent Posts
IOTD
Dailies and Latest developer news
Articles
I'm currently using the black theme which I much prefer. I do like the style generally. My main problem is that everything seems a lot bigger and more spaced out. I appreciate that this is an alpha theme though. It feels like the panels on the main page should be able to be dragged and dropped into position in the same way that I can do on igoogle for instance. This functionality would help with some of my other dislikes.
I'm a bit puzzled about the fixed width layout of the page. People usually use a fixed width layout to avoid the problems of resizing the browser window, the drawback is that you obviously lose the space at the edges. With the current setup the site has all of the disadvantages with none of the benefits. Space is still lost at the sides when the browser window is maximized and the content is mangled when the window is shrunk.
Most recent posts - Please move this back to the top. A lot of people have mentioned this so enough said
Dailies and Latest Developer news - I much preferred it when there were separators between each days news. It was a lot easier to read. Each item also had it's own heading, a nice icon and was generally easier to scan through. The current version just looks like someone has cut and pasted a text file to the front page, well maybe not that bad.
Latest Articles - I much prefer this to the old version. It uses the same amount of space but shows a lot easier what each article is about.
I can't seem to find the 'active topics' page. I'm assuming it no longer exists as it doesn't even work on the archived old-format site. For me this is a big loss.
Changing display name - Great feature, especially as I spelt my user name wrong when I registered and was unable to change it so a win for me
Fast Reply - I like this, allows me to keep the most recent posts visible while replying.
Careers - This is not so important for me. Even if I was actively looking for a job I wouldn't need it to at the top of the page. I can understand though if this is a source of advertising revenue and you want it to be prominent.
Just a few thoughts until I have time to explore the site more.