• "Xray is the missing link between the browser and your app code. Press cmd+shift+x (Mac) or ctrl+shift+x to reveal an overlay of what files are powering your UI – click anything to open the associated file in your editor." A lifesaver, if only for working with other people's code.
    (tags: rails views tools gem )
  • "MiniProfiler allows you to see the speed of a request conveniently on the page. It also shows the SQL queries performed and allows you to profile a specific block of code." Ooh, been looking for the latest version of something like this for a while.