Apple's first quarter was the quarter ending December 31, 2009, including the always-important holiday buying season.
You can join in on the call several ways. First, you can listen in on the streaming audio from the event by opening www.apple.com/quicktime/qtv/earningsq110/ in your favorite browser at the appointed time. Second, come back to TUAW at about 4:50 PM ET / 1:50 PM PT and sign into our liveblog tool CoverItLive to add your questions or comments.
If you can't make it to the liveblog, the entire transcript will be available for your reading pleasure after the event. A recording of the conference call will be available at the Apple URL listed in the previous paragraph.