RIM on Thursday finally shed some light on BlackBerry PlayBook sales to date. Shipments to sales channels totalled 500,000 units in the first quarter, in line with the high end of analyst expectations. Analyst expectations ranged from 200,000 to 500,000 units — earlier this morning, RBC Capital Markets Managing Director Mike Abramsky said his firm expected PlayBook shipments to total 450,000 to 500,000 units, with 200,000 in distribution channels and 250,000 to 300,000 having been sold to end users. RIM did not reveal how many tablets have been sold through to end users. To put RIM’s PlayBook shipments in perspective, Motorola shipped 250,000 XOOM tablets during its first two months of availability, and Samsung shipped over 1 million Galaxy Tab units in less than two months.