The U.S. economy is taking its toll on more device makers. Research In Motion (RIM) said it expects lower revenues for the third quarter, in the range of $2.75 billion to $2.78 billion, which is lower than previously forecast. The company blamed foreign exchange impacts and lower-than-estimated unit shipments as a result of the economic downturn.

RIM also said it expects the number of net new BlackBerry subscriber accounts added in the quarter to be about 2.6 million, which is lower than the 2.9 million previously forecasted but reflects a 57% increase over the same quarter of last year.

RIM did say it has seen particularly strong momentum in recent weeks. Daily net subscriber account additions reached a record level on the day the BlackBerry Storm hit stores with Verizon Wireless late last month.

On Monday, Palm announced it expects lower revenues as a result of reduced demand for maturing smartphone and handheld products. The company is implementing cost-savings strategies, including layoffs in its U.S. workforce. Palm’s shares were trading at a meager $1.94 this morning.