I noticed that a portion of my traffic today and yesterday has been coming from surfbits.com and macreviewcast.com, which happen to be the same site. The site is the homepage for the Mac Reviewcast, a weekly podcast that reviews new software for the Mac OS. Anyway, in episode #170 (iTunes link), my app Date Difference is mentioned. The review is very nice, and does a very good job summarizing the app. The review runs for about a minute, starting at 16:19 into the podcast.
This is (as far as I know) the first time anyone has reviewed Date Difference, and it certainly makes me feel special.