Remember the milk is a website originating in Australia, with some novel features for scheduling reminders. It must be good, because their marketing consisted entirely of telling a few friends, and usage is now in the millions.
I was fortunate enough to attend a presentation on it last week, given by its instigator Emily Boyd, under the auspices of an evening put together by the webdirections people.
This allows the application to read and interpret data entry as it's typed. Further, entering a schedule date is made easy with intuitive language interpretation, eg "next wednesday" or "every fortnight from the 21st". All this is apparently painful to program, but yields a very user-friendly interface: "enter as you think".
Another little quirk is: instead of an annoying dialogue box: "do you really want to delete?", it yields an "undelete" function. Again very friendly. Microsoft will probably quietly introduce improvements like this...