The number of pageloads has increased dramatically, while the number of return visitors doubled. This, I believe, is partially due to the increase of traffic from google images. From the detailed logs, I know that they make up roughly half of the unique visits each day.
Latest Weekly Snapshot
A "returning visitor" is defined as a visitor who opens the blog and reaccesses it more than three hours later. The system isnt perfect but it is smart enough not to register my own visits. However, if someone opens my blog from a different computer or browser, it will not register as a returning visit but rather as a unique visit. Due to the amount of data collected, the statistics are valid despite these shortcomings.