By Dan Gallagher, MarketWatch

SAN FRANCISCO (MarketWatch) — While the iPad currently rules the nascent market for tablet devices, a large swath of rival products is expected to benefit from booming demand for mobile-computing gadgets over the next four years.

So predicts Oppenheimer & Co., which in a report Monday forecast that shipments of tablet devices will soar from 15.1 million units this year to more than 115 million in 2014 — a compound annual growth rate of 66.5%. (cont’d)