Tashanna pointed out a interesting website that lets you schedule a web calendar using regular expressions through email and IM. Its kind of like Sandy and other useful websites but may be an alternative for some.
You just use simple English and it will setup a reminder for you. This can be done through GoogleTalk/Jabber or email. You can also subscribe to your calendar through RSS and get email reminders.
Obviously this is not for most of you who need a regular calendar but I can see this being useful in certain situations. For example, this would be a great way for my wife to email me the shopping list…
Or you could just use Google Calendar and Google Sync or BES like me.