Mr. Mike in the forums brought up an interesting question... we all have our hourly rates for design work, but what should you charge for other tasks, such as quoting, phone calls, research and travel (including sitting in the airport)?
This really comes down to personal preference. It isn't uncommon to have a lower rate for such work. Often, the best solution is to work it into a flat rate, based on your estimated hours. Every individual task doesn't need to be outlined in a quote, but be up front with clients about what they are being charged for. After all, just because your title might be "graphic designer," there is nothing wrong with charging for non-design tasks when working on a project.