Is (non-iOS) Tablet Inventory Building?

A recent article in the Guardian suggests recently announced labor cuts at factories producing the PlayBook tablet for RIM coupled with building inventory levels and falling sales may signal building inventory of the RIM tablet.

Update: A report on 9/26 that PlayBook prices are being marked down in certain retail channels to reduce inventory.

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Yesterday, NPD released a glimpse of Ultrabook sales year-to-date. A