Though the Apple iPad will be available to US customers come April 3rd, 2010, those outside the US will have to wait a bit longer.
Though no specific date is announced yet, Apple indicated in a March 5th, 2010 announcement that the iPad will be available first in the following countries:
come "late April". Pricing details are still yet to be released.
UPDATE: Apple will begin taking iPad pre-orders outside the US on May 10, and will ship the iPad internationally in late May. The delay is due to high US demand for the device.