coolendar
www.coolendar.com/ (xhtml-mp)
This is cool! Coolendar is a deceptively simple looking cloud based calendar and to-do list that's is very easy and intitive to use. You add entries (Coolendar calls them "Plans") by typing into a single free form field in Coolendar's iPhone or Android native apps or their nWebapp
Coolendar's natural language query processor looks for date or time related cues in entries like "Move the car tomorrow" or "Friday 9AM planning meeting" and creates calendar entries for them. Entries without dates or times are treated as to-do's.
You can flag entries as Important and mark them as Done. A filter drop down lets you view only entries for Today, Tommorow, This Week or just ones flagged as Important or Done.
Coolendar is well connected. It uses your Google account for authentication and login, but the Coolendar Calendar is independent and not stored in Google Calendar by default. If you wish you can sync Coolendar with Google Calendar Apple ICal or Microsoft Outlook. You can also create Plans using Gmail or Google Chat by sending a specially formatted email or IM and Coolend and can notify you of impeding events by email or Google Talk. Coolendar's email notifications contain handy libnks that let you mark the plan as complete and/or delete it or reschedule it.
Although it's not mentioned on Coolendar's site, the web app is mobile aware, the layout and logic adapts to work perfectly in the Android, Symbian and Opera Mobile browsers. It's functional, if a bit clunky (too large font, lots of server round trips) in Opera Mini. I suspect it will work in just about any browser with at least minimal JavaScript support.