Apple might move as many as 400,000 iPads in just its opening weekend, Bernstein analyst Toni Sacconaghi said in a note on Tuesday. Without knowing exactly what content and third-party distribution will be available, the financial researcher claimed to be conservative and said that between 300,000 and 400,000 of the tablets are likely to ship. The total would include both pre-orders and retail sales and is based partly on assumptions regarding the original iPhone, which sold 270,000 units in two days at similar pricing and with a US-only release.