I was hoping that Google Calendar would enable me to link to it and viewers not have to have a Google account to view the calendar, so I found a WP plugin which I have implemented on to my travel rants blog.
It's a little restrictive but I can enter an event and the calendar highlights the day, when you hover over the day it tells you what the event is.
You can download the plugin here;
http://n0id.hexium.net/plugins
Enjoy!
Darren