The site look very nice and seems to work well, although I didn't really do anything active there.
Are you going to have an introductor home page, though? A site that is just a log in page isn't all that exciting. How will people fine out about the site, and how will you encourage them to get involved / use the service?
Ah, I see, there is a home page:
- if accounts are free, how do you make a buck out of this? Maybe have an FAQ page. This sort of thing always makes me suspicious
Also, this paragraph needs a full stop / period instead of a comma:
Just create a checklist and start filling it with all the important things to do in the run up to your big day, Keep track of your more important tasks with reminders and notifications.