I remember a few years ago (before I had even heard of Litmus) having to set up a bunch of test accounts and email clients to check rendering. I can imagine a bunch of you were in the same boat. So, now I'm curious: How much time do you think has been saved by using something like Litmus? Or for you web designers out there - something like BrowserStack?

As a side note, I remember having to sign in to a server on Windows to test out IE6 rendering when I was doing front-end design work. Talk about a nightmare.