One day I'll get round to reading the manual for all the devices I use on a day to day basis. No doubt I'll then discover lots of things I never knew - and from then on, life will be more productive, but more boring. In the meantime, I can continue to bump into cute features that surprise me.
I just discovered that if you drag a file to the iPhone Simulator, then it will open (or at least attempt to) the file in Safari. It works for images - very useful for adding images to the PhotoLibrary. I've just tried it on a PDF, text, and HTML file, and they all worked as well. A lot easier than typing in the URL to your test site.