I think "recommendation" will be a killer feature of the site, even if it doesn't approach the philosophy behind letterboxd (being a social site).
Moreover now that you are at the beta stage, meaning fewer users, less probability of "friends", the recommendation of a movie based on my most liked movies or the highest rating, it'll be a great way of discovering new movies.
I know that technically it will very challenging or maybe you have even think about it.

The ability to list one's favorite films is great, especially when sharing preferences with friends; the opportunity to list favorite actors would be just as convenient. Adding a "favorite actors" category to a users profile page would be a fairly simple change that could really add a lot of personality to each account.

I imagine some kind of inbox or notification system where you can receive suggests from your friends. The film menu you see on mouse over can get an extra option "Suggest to friend..."

When I export my Letterboxd Lists, the Notes I have entered appear in a field with the DESCRIPTION header. However, there does not seem to be a way to import those Notes into a new Letterboxd List. In other words, there is not a field in the Import Header template that seems to correspond to the DESCRIPTION (or Notes) field. Can you help?

I have over 5,000 movies on my list and at this point I'd like to just clear it out altogether than go through it movie by movie

I love Letterboxd, and I love Filmstruck. Sadly, Filmstruck has no rating system nor way to track what I've watched. How cool would it be if your two organizations partnered up! It would bring visibility to Letterboxd and give Filmstruck a huge missing feature.

Hopefully you're at least having coffee with the Filmstruck folks on occasion. :)

Allow a list being 'open' which then users can follow a list and add films to it. This will result in much more list activity and complete film lists.

Take for example http://letterboxd.com/pablos/list/special-powers/. I can easily add 10 more movies without any effort to make the list more complete.

Optional: to demotivate abuse, submitted films must be allowed by the list owner before being added.

Would be great if we could cross two or more lists generating a new list (temporary or not) as a result.

A greater possibility of films exploration.

I'm always dying to explore better giant lists like Palm d'or Nominees to see how many films an director has in it. Or another example to intersect this previous list with Criterion collection etc etc.

I have a lot of private lists for organizing my opinions for films as well as information for my YouTube channel and Instagram, and I keep having to search through my list longer than I thought. I would really like to see folders be visible, so that folders are visible in the lists section, while lists that can stay out of folders can be visible normally in the same section. Please take this into consideration!

Do we really need the Popular Users page? it just turns the site into a popularity contest.

Block user needs to block everything. I don't want to see said person's reviews or anything they have to add to the site. Certain people think this website is their personal blog.

As I add films to my diary, I would love to have a feature for private notes (instead of a public review). I know there's an option for private notes, but only if you additionally add the film to a list.
I think it would be handy for various reasons: to not forget ideas you had about a film without needing to write up a review right away, taking note of noteworthy scenes in a film for yourself so that you can remember it much later, etc.

I often find that I want to list things other than films. It would be great if I could create a list of, for example, the Best Directors. Or list my Favourite Japanese Actresses. Or make a list of popular Animation Studios.

Solve the problem of "What haven't you seen?"

Two friends wander the store but can never find something they both haven't seen. A list of films filtered as unwatched for two users could be sorted by popularity and save the day.

From this point it shouldn't be too hard to expand the formula to deal with the multiple roommate or group movie night problem. Trying to find a film that you and 5 of your friends haven't seen would wonderful!

As simple as that, open this settings only a couple days/weeks before the actual launch.

Long-time Filmtipset.se user, now migrated to Letterboxd. What I miss more than anything else is an advanced search option. I use this very frequently to set up different lists. For example, thrillers produced in France between 1960 and 1964, documentaries produced in Sweden between 1930 and 1945 or short films produced in the US between 2000 and 2015. You get my point.

Like twitter.

Even though some Netflix docs have multiple episodes they're still Documentaries and i'd really like to add them to my movies