It's been a while since the last update, but digester is still alive and well! The reason it took a bit longer this time is that I have started a part-time freelance job, which reduces my "digester time" to one day per week. But also, I have been working on this rather big milestone.
So what are Lists about? Digester does not help with discovering new content. So far, you'd have to enter a specific URL of a blog or the name of a Github project in order to get weekly updates with new blog posts or project releases. This is improved with Lists by being able to groupe blogs and projects in a List and then share it.
For example, let's assume I was currently interested in JavaScript. I could now go ahead and create a new List called "JavaScript Ecosystem". I could add some relevant blogs of prominent people in the world of JavaScript as well as some related Github projects. Instead of subscribing to an individual channel (blog or project), I can now create a subscription for a list and thereby get a convenient update about what is going on. By sharing this list with fellow JavaScript people, they can profit from the work I already did with collecting blogs etc. Furthermore, they'll keep getting updates from blogs I might add in the future.
The List feature is not entirely complete though -- in particular the list themselves are not easily discoverable. While it is possible to search for lists in the subscription center, it might be interesting for the users to know what lists there are (eg. sorted by popularity).
While I still need to plan the next milestone, things I have in mind are the following: Rework the landing page to include some popular lists, allow users to subscribe without creating an account (already started some work on this) and adding more channels (eg. youtube or twitter).