I also wouldn’t mind a series on it as well.
What level of discussion are you looking for? How to use it, a look at the source, or something else entirely?
Content on Rails internals in general is something I’d welcome, specially in the Weekly Iteration format.
A walk through the internals of arel would be cool. I’d also like to see how Thoughtbot typically uses Arel in their own apps. Do your devs just throw them in an ActiveRecord model, do you create poros to handle them?
What are some advanced usages of Arel that go beyond what’s listed in Arel’s readme.md in their repo.