get notices about when you should use eager loading (n+1 queries) and when you've got unused eager loaded data

jQuery plugin by John Resig to deep profile your web app and get a list of time spent per function. Just used this to profile something and it worked great.

Fascinating study in A/B testing to improve clickthrough rates for a twitter profile link.

A Framework and ORM agnostic Model / record attribute tracker to ensure production Ruby applications only fetch the database content needed to minimize wire traffic and reduce conversion overheads to native Ruby types.

"This rails plugin not only runs "EXPLAIN" before each of your select queries in development, but provides a small DIV in the rendered output of each page with the summary of query warnings that it analyzed."

always good to keep basic seo best practices in mind

nice, free rails app monitoring