Planning conference calls across time zones

My business partner lives in Louisiana (the north of the state thankfully so she was out of the way of hurricane Katrina). After 5 years working together we instintively know what times windows are good for phoning each other. However, we sometimes need to patch in one our hosting support people from Seattle or a contact in Australia. It's then that things can get tricky.

I've used Time and Date before but thanks to Lifehacker for pointing out the newly updated meeting planner which helps to pick a convenient time to suit all. What a great utility.