I think localization needs some work. In particular, there are some start of week and timezone issues. I live in Israel, where the week starts on Sunday. However, I'm seeing all the calendars and checkboxes start with Monday. Also, in my profile, it incorrectly detects the timezone as being Athens instead of Jerusalem/Israel. In any case, I think it's a mistake to rely exclusively on detection. It makes sense to use it to set defaults, but both of these should be settings that the user can manually set. I travel often and use browsers in different countries. I expect to continue to see things "my way", and not whatever happens to be the "local way". It's just like language: if I travel to Russia, say, I wouldn't expect the interface to switch to Russian all of a sudden just because the timezone changed. That would be just a little bit confusing.