Analyst Mark Moskowitz of J.P. Morgan Research has warned investors in a note — as reported by “AppleInsider” (http://www.appleinsider.com) — that build plans for iPad shipments from Apple’s rivals may be too high, presenting “increasing risk of a bubble burst” in the second half of 2011. He estimates that Apple could see nearly 100% sales growth year over year, resulting in more than 29 million iPads sold worldwide in 2011.

“In our view, the technical and form factor improvements of the iPad 2 stand to make it tougher for the first generation of competitive offerings to play catch-up, meaning actual shipments could fall well short of plan,” Moskowitz wrote.

Using discounted build plan estimates to project tablet shipments for the year, the analyst claims that tablet makers will build approximately 65.1 million tablets this year. When compared against J.P. Morgan’s estimates of 47.9 million tablets sold this year, companies could find themselves with as much as 51% oversupply in a worst case scenario, notes “AppleInsider.”