Lots to say.
First. Project system is awesome. It will make beta-testing really easy to manage. Without it I'd have to develop my own way of only letting certain people play a game.
I miss the forum timestamps. This "about 2 hours ago" crap is just dumb. You've got to be at least 13 to use NG, I think that's old enough to be able to do some simple subtraction. It's just too vague this way, it almost feels condescending. We could choose to display at specific timezone maybe. Possibly both an accurate timestamp and the relative time.
Overall there's just not enough information. It's too hard to figure out the score of a submission. And the frontpage is just crappy. It's a bunch of images that you need to mouseover just to get a title of the movie. Youtube gives more info than that! Youtube! It doesn't even give you the author's name. Even after clicking you have to scroll way down the page to see who made it. I really need the short descriptions to tell what a submission is about. Otherwise I have no idea what a submission will be without clicking on it. If that doesn't change I'm just going to start putting text in the preview images for all my movies and games, and I suggest others do the same.
The other submissions by this author dropdown needs to come back. Tom might prefer to go to their userpages, but when you're not 30 feet from the servers it takes too long.
One thing I'm not sure how I feel about is the new auras. I'm both a Game Developer and an Animator so I don't know which to choose. It's also a problem when I credit myself in submissions, so I just use the generic author. I'll just have to remain a blank slate for now.
The background art seems too colourful to me. I'd prefer it in greyscale. And when you scroll down a page past the art it just looks ugly like someone put a tint on the old dark grey backgrounds. Not a huge issue really, it won't affect my enjoyment of the site too much. It really depends on what people new to the site think of it, it's really for them, as the rest of us will start ignoring it after a day or two.
Small issue. After clicking the box that pops up before the flash plays, it takes moment for the flash to actually show up.
If it's only one vote per submission per user, do nonusers still get to vote? And how is tha kept track of? Just permanently storing their ip address?
I really like the recent notifications do-dad. It's something newgrounds has been needing for a while. I recall a friend favouriting an author and assuming it was like a youtube subscription, and having never questioned it before, I wondered why it wasn't.
Another thing I like is not having to load a new page to look at more reviews. Another little detail NG needed to keep up with other big sites.