Awhile back mackie pointed out a curious utility but sadly I forgot to mention it. I plan on correcting that by letting you know about Phone Call Analysis by Nicola Damico. The app performs a simple yet interesting report on your call log telling you the breakdown of your incoming, outgoing, and missed calls. Nothing fancy but it does break down things like number of calls received, duration, average duration, and contact groups that get the most calls.
Phone Call Analysis gives you some quick insight into your phone call log and is totally free in App World. Let me know what you think of it!