Some posts on agile
How long should a story be and when should it be documented:
http://rosepruyne.blogspot.co.uk/2013/01/is-your-team-using-fake-agile.html - are you doing agile, but?
Getting things done with trello http://rosepruyne.blogspot.co.uk/2013/02/get-it-done-with-trello-part-i.html
Editing source files from Developer Tools in Chrome
Great intro vid from @rem http://remysharp.com/2013/07/18/my-workflow-v3-full-coding-stack/
There’s an article on HTML5 Rocks linked by Paul Irish in the comments that covers how you can edit sass from Dev Tools using source map generation within the pre-release version of the sass compiler.