My client has just pointed out the following to me...
This is on your blog:
Participant will not only have the option to set whether they are 'attending' or 'not attending' (duh!), they will also have the option to export the event to iCal. Check out the main screenshot of 'Event'.
Looks like we removed this from 2.0. I can see that the view file still exists. I will check with the team and see if we can push this out on the next release.