Well, when I check it from the UK online store it says that no carrier is assigned. However, if I check from the US online store it says that it is being shipped via Syncreon (who apparently are an amalgamation of Walsh Western and TDS Logistics). I know Walsh have shipped Dell machines at work.
Anyway, when I click on the track button from the US online apple store, it reveals a tracking number that begins with WW so I presume it is actually being shipped via Walsh Western. When I got to the WW site to use the track and trace facility, I have to enter a customer number and an order number. I don't have a customer number though. ERGH! Frustrating!
Know the feeling! Ordered a 3.06GHz with wireless mouse and AppleCare on the 29th (lateish afternoon). Shipment was originally estimated at 5th May, but it slipped a day, so arrival has moved out to the 15th (previously 13th-14th). Still - it hasn't stopped me from checking the tracking page every few hours for the last few days!
Decided to make the permanent switch from a 4 year old self-build PC (after 3 or 4 too many BSODs and NTFS rebuilds) - having trialled MacOS X via a 12" Powerbook for the last few months to ensure the wife can cope with the brave new world!
Can't wait now... it's like waiting for Christmas, but not knowing what date it's on! (I couldn't even hold on until the new Belfast Apple Store opens up!)