Nuevasync does not work with v2.1 update. It freezes the calendar. They are working to resolve and think that new update (2.2 ?) will correct. See
http://nuevasync.blogspot.com/ for information.
I am currently using Google Calendar. It sends email for each item ( if requested) and also sends an email for the entire day's listing. You can add an event on Google calendar and it will show on the Google Calendar set up on the on the iphone and vice versa.
The only problem and it's a big one is that there is no audible reminder-ie NO ALARM.
Hoping Pocket Informant for iphone will solve my problems.