Mr.Z's popular pages tool appears to be down and not coming back up: https://en.wikipedia.org/wiki/User_talk:Mr.Z-man#Popular_pages. Many apparently miss it. Any chance that Community Tech can look into this?
Existing code at https://github.com/alexz-enwp/popularpages
Existing interface at http://tools.wmflabs.org/popularpages/
Sample report: https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Spiders/Popular_pages
See also Category:Lists of popular pages by WikiProject
Community Wishlist request (#9)