ESA has released the E3 schedule recently which will be held from 11th July to 13th July at Santa Monica. Microsoft starts first with Pre-E3 conference at 8:30 PM on 10th July, with Nintendo hosting their conference on 11th at 9:00 AM.

The schedule goes this way

7/10/07:

* 8:30pm - Microsoft Press Conference

7/11/07:

* 9:00am - Nintendo Press Conference
* 9:00am-5:30pm - Meeting suites open at the Fairmont Hotel
* 11:30am - Sony Press Conference
* 1:00-6:30pm - Barker Hanger open to view games
* 2:00pm - Electronic Arts conference
* 3:15pm - Activision conference
* 4:30pm - Midway conference
* 5:45pm - Konami conference

7/12/07:

* 8:00am - Take-Two conference
* 9:00am-5:30pm - Meeting suites open at the Fairmont Hotel
* 9:15am - THQ conference
* 10:30am - Ubisoft conference
* 1:00-6:30pm - Barker Hanger open to view games
* 1:00pm - Namco Bandai conference
* 3:30pm - Disney Interactive conference

7/13/07:

* 9:00am-3:30pm - Meeting suites open at the Fairmont Hotel
* 11:00am-3:30pm - Barker Hanger open to view games

There will be few participants this year, you can check the list here