As smartphone shipments surge, the mobile market remains dominated by two operating systems: Android and iOS. Android maintains a commanding lead, with over 68% of all smartphones shipping with the young and robust OS. This, of course, comes at the expense of its elders, such as BlackBerry and Symbian, while iOS keeps its small but steady pattern of growth as it gears up for the release of its next grand iteration.

No surprises as the latest Nielsen numbers show Android and iOS leading U.S. smartphone market share. Both operating systems continue to gain at the expense of RIM — who has all but fallen into the “Other” category. Speaking of the “Other” category: Windows mobile, Windows 7, Symbian, and Palm/WebOS were all grouped together, combining for a measly 5.9% market share.

comScore remains a leading source for measuring key mobile trends, and their latest report is giving me a sense of deja vu. If we look at the results from the three month period ending November 2011, it’s safe to say that not much has changed. Samsung still remains the top OEM with 25.6 percent of U.S. mobile subscribers (up 0.3 percentage points), followed by LG with 20.5 percent. RIM finished last out of the top 5 with a 6.5 percent share (down 0.6). As for mobile OS platforms, I bet you can guess who’s leading.