Google web calendar service

"Google Inc. is introducing on Thursday a free Web calendar service for consumers to schedule events and share them with others, opening a new level of competition with rivals such as Yahoo Inc. (Nasdaq:YHOO - news) and Microsoft Corp."

Read more:
http://news.yahoo.com/s/nm/20060413/wr_nm/google_calendar_dc

Try it out:
http://www.google.com/calendar