I assume watch a feed on Twitter for a search about your company or product. If people on Twitter start complaining in mass about your latest push it's probably a good sign that you need to roll back.
Ok, this is what I also assumed - although I would never rely upon this as part of my continuous deployment process, I guess it does little harm to still monitor and be aware of such things...
As a developer using Visual Studio in my day job for the past six years, I simply cannot get a hold of Eclipse. I have tried repeatedly, and failed because it is so very clunky, slow, and unintuitive. Have recently been playing with IntelliJ, and think I will stick with this for the time being.
However, of course, Visual Studio with Resharper has just spoilt me rotten, can't expect that environment from every IDE.