Web Developer Checklist
Liked the favicon part, very often forgotten...Would be nice if this was open sourced so more items could have been added by the community (also framework specific checklists) but I like the conceptOne thing I would add which is driving me crazy on mobile / tablet sign up pages  - make sure your email fields are annotated with type="email"

Another common issue is with SSL mixed content waring, so I would also add  - make sure to use protocol relative / https only URLs 

(with a reminder to NOT use protocol relative URLs in email templates, your outlook users will appreciate it)