I had a couple phone interviews allowing the interviewer to learn more about my background and skill set. The interviewer then asked me to provide some samples of my work along with details of the project. I spent a lot of time preparing the materials and felt they offered plenty of insight into my design process and abilities. Was told due to scheduling difficulties (I assume from other candidates) the first round interviews would need to be extended and he would get back to me with updates. From that point on I never heard back from anyone, even after sending a couple of inquiries if I was still a viable candidate. I never have a problem being told I'm not the right or best candidate. What I find unprofessional is when a company simply stops communications. Especially if I put in a significant amount of time allowing them to get to know more about me and my background.