I used the official geocaching app on my Android this week-end (version 2.1.1) and I have seen one small bug in Field notes uploaded to the geocaching.com website regarding the log date.
The date shown next to the field note is shifted by a couple of hours. I mean, a cache found on 11 November 2011 at 17:00:57 (the time I saved the log in pending logs) shows 09:00:57. That is -8 hours. I live in France and using my Garmin Oregon 450, uploaded fields notes are shown local time on the website without problem.
As I used fields notes with logs uploaded from both the android app (new caches) and my Oregon (already existing ones), this shift makes it much harder to keep the caches logged in order.