Phone calls as an easy way to judge a person, actually. Tone, inflection, word choice, ability to follow a conversation are all indicators of the type of mind you have without them being distracted by anything in person. Saves them time and you a commute. Honestly, it's an invaluable first screening when the companies aren't doing group interviews.
Question though, did you keep a notepad handy for key points of the conversation? It's not quite the same thing but when I worked in an office and had sales calls or talks with contractors I often kept a notebook running with key points of the conversation so I could refer back to what I spoke of and guarantee that I wasn't repeating myself or getting locked into any one aspect of the conversation. Keep it moving was always vital. Often, if I knew the call was coming or I was making it, I'd write down things as bulletin points before I ever started the convo so I had a guideline to work off of.
Oh, and Yang and Greg... you two are so alike. Weirdos! *snickers*