Just received an email from Apple Australia - my shipping date has been brought forward by 8 days to April 14th. I can finally stop checking the shipping status every few hours. 
Dear Apple Customer,
Thank you for you recent order with the Apple Online Store.
Due to overwhelming demand, the shipment of your order has been delayed. We anticipate that your order will now be shipped from our warehouse on 14 April. When your order ships, we will send you a shipment notification email with the anticipated delivery date and tracking information.
We apologise for any inconvenience the delay has caused.
Thank you for choosing Apple!
Kind Regards,
The Apple Store
Weird thing is the order status from the Apple store is unchanged:
Custom Configuration| Hide
2.93GHZ INTEL CORE 2 DUO
4GB 1066MHZ DDR3 SDRAM-2X2GB
ATI RADEON HD 4850 512MB
1.0TB SERIAL ATA DRIVE
APPLE MIGHTY MOUSE
KYBD (NUM) & USER'S GUIDE-X
COUNTRY KIT,IMAC 24-AUS
Ships: 22/04/2009
Delivers: 29/04/2009
Let the flood of 4850 updates begin!!!
Dear Apple Customer,
Thank you for you recent order with the Apple Online Store.
Due to overwhelming demand, the shipment of your order has been delayed. We anticipate that your order will now be shipped from our warehouse on 14 April. When your order ships, we will send you a shipment notification email with the anticipated delivery date and tracking information.
We apologise for any inconvenience the delay has caused.
Thank you for choosing Apple!
Kind Regards,
The Apple Store
Weird thing is the order status from the Apple store is unchanged:
Custom Configuration| Hide
2.93GHZ INTEL CORE 2 DUO
4GB 1066MHZ DDR3 SDRAM-2X2GB
ATI RADEON HD 4850 512MB
1.0TB SERIAL ATA DRIVE
APPLE MIGHTY MOUSE
KYBD (NUM) & USER'S GUIDE-X
COUNTRY KIT,IMAC 24-AUS
Ships: 22/04/2009
Delivers: 29/04/2009
Let the flood of 4850 updates begin!!!