Apple - please give some serious attention to the mess you’re creating with your Calendar APIs and apps, please. I could complain about the mess you caused by duplicating calendars when people upgraded to Lion to be able to support Reminders outside of event calendars, or I could complain about how you’ve yet to provide a way to use your CalendarStore framework to sync directly to iCloud and still require iCal to do this, but I won’t. 
I will, however, complain loudly about the mess and inconsistency shown with your current implementation of Reminders. (Specifically, the concept of “due times”, which you fail to properly implement in 2/3 of your own calendar apps). It is impossible to create a Reminder due on a certain time with Lion’s iCal, or even iCloud.com!

Q: I want to show the Calendars sidebar all the time as I could in previous versions of iCal. Can I?
A: Nope. Cupertino thinks you don’t need to see this. Sorry.

This post will tell you what a delegate is, how to get rid of it if you need to, and how to get your ical and iphone to be properly in sync with multiple top level calendars

I just had a look at the top keywords for the last 7 days. not surprisingly there are lots of entries for ‘ical delegates’, ‘google calendar’ + ‘delegates’, ‘what are ical delegates’ etc. so, I had a look at the stuff I did with google calendar, syncing it to your mac’s ical and thought the explination was a little poor.

To make Mac OS X show week numbers in iCal is actually not that difficult.
You simply need to add the week number to the full date notation and your done.

Douglas Bowman på Stopdesign om High Priority, ett litet macprogram som ger enkel tillgång till att göra-saker från iCal.

Hur man publicerar iCal på en Apache-server.