Couple Ideas...
Just some thoughts, in case these aren't in the works or you're looking for ideas ...
Seen some calender addons that include an automated event entry that serves as a notifier when raid instances are scheduled to reset. Clearly, ZA is a good example, as it resets every three days. I don't know what Wrath instances might provide, but if they have non-daily or weekly reset periods, having those on the calendar would be most welcome.
Reoccurring events would also be handy for the groups that run the same each week.
Extended events that are planned to occur during specific hours for multiple days would be nice as well.

Thanks Nite. Good ideas. I
Thanks Nite.
Good ideas. I am still waiting for the authors of the date functionin Drupal, which this site is built on, to finalize the mod for repeated and information such as resets. Along the same lines, we are watching a couple of mod authors progress with a ingame calendar exporter mod. Once it is done we will provide a way for you to upload a file to import any events/raids you created in game. Only downside I see is that Blizzard will not allow uploading to the calendar. But that could be worked around.
Now, that seems very
Now, that seems very interesting ... a site-based calendar with in-game synch (even if it's only in one direction) would be a real achievement and useful tool, especially for those who can sneak a few moments of WoW-related business at work, but simply cannot go in-game.
WTF Guild - Greymane - US - Alliance