Within 48 hours, Apple sold out of its allotment of new iPads announced at its event on Wednesday. Online preorders are now scheduled for delivery in two to three weeks, according to the Apple site. And that date could continue to be pushed back as orders pile up. As usual, ordering on Wednesday afternoon was tough. Just when you thought you'd gotten through to check out, the site crashed. But persistence paid off. By Thursday, orders went through without a glitch. Apple has sent emails to early bird buyers confirming delivery for March 16 as promised. But those who hesitated will have to wait. Apple has confirmed that all new iPads have sold out — black and white, AT&T and Verizon and 16-, 33- and 64-GB tablets. Saturday's March 19 delivery date slid to several weeks by Sunday night. Verizon may have lost its advantage with data-hungry buyers. The carrier's 10GB data plan wasn't listed on Apple's site. AT&T offers 3GB and 5GB plans only. Take a look at our "How to Choose a Data Plan for Your (New) iPad" for details. People still have a shot at getting a new iPad in their hands this Friday by visiting their local Apple store, Best Buy, Radio Shack, Target, AT&T or Verizon.