As Stephen Harris and Wyck point out, I agree that **Q&A Highlights** is a given.

Expanding on it, the librarian in me would be interested in ***Editorializing the Archives***.  
Like a "Tag research", say an article mashing up  *Theme Development*.  
<sub>Something in the lines of this answer I wrote: [Looking for WordPress System Diagrams](https://wordpress.stackexchange.com/a/58095/12615).  
Or this great post Andrea_r G+ the other day: [How to do damn near anything with WordPress](http://stephanieleary.com/2012/10/how-to-do-damn-near-anything-with-wordpress/)</sub>

 - **Comment of the Day**: there's a meta somewhere about this... So many gems we met in the comments threads getting lost in the dustbins of memory, it's not fair!

 - **WPSE Plugin Repository**: [The plugins that came out of WP-Answers](https://wordpress.stackexchange.com/q/18459/12615)... Also, many little gems floating around that didn't make into that wiki. And could morph into a category,  a post series or a page or something more live.