Apple's ship date for the AirPort Express has slipped. Customers who pre-ordered the mini base station were given a July 15 ship date. However there are reports that Apple has sent email indicating a delay and a new ship date of July 30.
The Apple Store is now showing a 3-4 week build time for the diminutive WiFi hub. It would appear that the massive 80,000 pre-orders have left Apple with a supply problem in Europe - in the same way as the iPod mini that was delayed for months owing to massive US orders. In the US the AirPort Express shipped yesterday.