"Main" feels way too bright and washed out. "Discussion" strikes a better balance.
(ETA2: ah, strike that - I was having the same weird caching issue many others have mentioned.)
This will take some getting used to.
ETA: also I regret that the tagline "a community blog, etc" has been rendered all but invisible in the main masthead (insufficient contrast) and in discussion (type too small). Either remove the tagline entirely or make sure it can be read - don't sit on the fence.
ETA3: so the tagline is OK on the main site, but my comments stand for Discussion.
ETA4: I don't know if that's a recent change or yet another cache issue, but that also looks fine in Discussion now.
I saw some discussion posts earlier talking about a LessWrong redesign, and now that things look different, I guess that it's been implemented. I'm always slightly annoyed for a while when a site I use gets redesigned because I have to relearn where everything is, but it eventually wears off once I'm used to the changes.
My initial impressions:
"Hmmm... it seems like the category menus have been replaced by dropdown menus. It's not like I used many of them anyway."
"Okay, I've clicked my name to see my recently posted comments. Now, where's the link to see it in context? Oh, I guess I have to click that icon in the lower right corner. For some reason I was looking for something at the upper right of the comment box."
"Well, that worked. Now how do I click to the parent comment? Oh, wait, it's probably one of those new icons in the lower right corner. I'll just mouseover them to see what they do..."
::realization sets in::
"AAUGH! LESSWRONG IS USING MYSTERY MEAT NAVIGATION!!!"
So, what does everyone else think of the new redesign?