Some notes / questions though:
I liked it better when the front-page section of recently popular notebooks showed the previews, vs. now when there’s only one big preview, two little previews, and a bunch of titles with no picture. The one big preview version might be better for driving clicks from non-users on the front page (or at least, this can be empirically tested), but it shows a bit less diversity of content and for someone trying to keep track of what the community is up to, the old version was more useful.
The “home” page is not quite as feature rich as it used to be, and the “explore more” link is not the most visible; I could easily imagine many users not noticing it / realizing it existed.
I don’t think the entire above-the-fold content of the explore page needs to be a repeat of the top 3 notebook previews that were already on the home page.
The “featured” and “popular this week” sections no longer show the number of likes on the listed notebooks. I found that to be a somewhat useful signal. (But maybe not necessary per se.)
It would be great to be able to see more than the 10 most-liked recent notebooks. For example to be able to see all of the notebooks from the past week/month/year sorted by number of likes. Trying to skim the whole firehose of every published notebook can be a bit overwhelming.
I think the demotion of collections is a bit unfortunate. For someone new to the site, clicking through some of the collections is probably the best introduction.
preview=true feature is great. I’d generally like to see more sorting options for notebooks on my own / other people’s notebook lists. The sort discrepancy between own profiles (most recent edit) vs. public view (date of first publish) can be a bit confusing.
Notebook lists on people’s profiles need to include the year in old dates, and I’d recommend including the year even on stuff published this year.
Edit: hopefully this doesn’t sound too negative… you folks are doing great work!