What do you use or carry with you in your “toolbelt” when approaching an existing WordPress site that you’ve got to extend or maintain? Is there a good Windows debugger? Are there essential addons you install, things you FTP right away?
Super WordPress debugging toolkit and triage procedures?
I use xdebug for php debugging, couldn’t live without it.
xDebug and Webgrind is very usefull for an great work; but maybe you will read more as example in this post.
Core Control plugin is essential. Mostly for cron tasks overview, but at times other functions (like HTTP logging) are also uniquely useful.