Hello Anand,
I have interfaced PICs with PalmOS (RIP) and the various flavors of Windows Mobile using hardware and Bluetooth serial ports.  I've been tasked with porting a BT application (that interfaces with a PIC-based device) to Android and my customer was nice enough to provide me with a Droid X.  Wow, what a good device.  It makes phone calls too...8^)
Haven't considered attempting USB yet.  I'm just barely past the "Hello World" stage at the moment.
A great starter link is here at hack-a-day.
Best Regards,
Paul
				
			 
			
		 
			
                        	
		         
			
			The way to avoid mistakes is to gain experience. The way to gain experience is to make mistakes.
			
			
		 
	
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