Maybe you are waiting for the Panasonic GF1 release but if you are ready to go for the Olympus E-P1 here you have the availabilty list:
Amazon US will have the Silver E-P1 in stock on August 15.
The White E-P1 usually ships within 6 to 10 days.
Bhphoto and Adorama do not have the E-P1 in stock.
Europeans have far more luck with most big stores having the include("buy/e-p1.php"); ?> in stock!!!