Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Research In Motion (NYSE:BB) got crushed today, down by as much as 10%, on gloomy market share figures released by Kantar Worldpanel ComTech.

So what: The market researcher pegged RIM's domestic market share at just 1.6%, significantly worse than the 8.5% market share it had in the U.S. a year ago. On top of that, there's renewed analyst skepticism that BlackBerry 10 may not be enough to turn the company around. The operating system launches next January.

Now what: Yesterday, Morgan Stanley called the stock "un-investable in the near-term," saying BB10's chances of success are small and that RIM is too late. Those comments are putting an end to the recent rally as shares have nearly doubled from the lows of $6.22 set two months ago. RIM also said late last night that it would release fiscal third quarter results on Dec. 20, and investors aren't looking forward to the figures.

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