Finally, Riverbed Technology ( NAS: RVBD ) actually reported strong results for its latest quarter, but its guidance spooked investors to the tune of 18.3%. For 2011, the company posted revenue growth of 32% and operating-income growth of 52%. The company continues to gain WAN optimization market share, and now has above 50%. In this space, Riverbed's quarterly revenue is more than double that of its cloest competitor. What's more, the company is planning to release new products to its Steelhead product line in the coming year, which should help maintain or even increase its lead.