English Proofread

https://www.debian.org/devel/website/stats/en#uptodate provides a list of web pages sorted by number of visits.

https://lists.debian.org/debian-l10n-english/ is the list of English review in Debian.

https://wiki.debian.org/I18n/SmithReviewProject explain an old similar project. The Smith Review Project was focused in debconf templates for packages, but since this effort is done and ongoing, we would focus in other kind of documentation that it's less reviewed: the Debian website, other website or very visited wiki pages, the templates we use to publish announcements, and other.