Research in Motion (NDAQ:RIMM) may finally be feeling the effects of gravity after the company’s stock dropped another 8% yesterday on profit taking from many investors who are growing uncomfortable over the company’s earnings prospects. The stock made a huge run-up last year that took the stock up over 200%; however, shareholders are now taking some profits off the table as speculation circulates that the momentum may not be sustainable.

The mobile devices network has been in a state of flux since Apple launched its new iPhone and Verizon decided to open up its network to new devices and software. Such open systems may not help the Blackberry given the many new, competing products that have recently come to market. Verizon already markets the Motorola Q and Palm Treo – two of Blackberry’s largest competitors, and there is no way to predict how this may affect RIM.

Meanwhile, Google’s recent decision to provide open wireless device software through its service – codenamed Android – will likely allow competing device manufacturers to insert Blackberry-like features onto their own devices. Clearly, this is a reason for concern for the Blackberry as competition then becomes simply a matter of design instead of software. And finally, we already know that AT&T has been pushing the new Samsung Blackjack, which may end up taking a slice of the pie.

In the end, this new competition may prove to put a strain on Blackberry’s market dominance. Whether or not it will materially affect the company’s stock remains to be seen, but it is certainly a great reason to take some money off the table, which is what many people think is happening right now. Combined, these factors make RIMM a stock worth watching!

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