You might want to consider using something like the SheevaPlug. ( ARM  
processor )
http://www.marvell.com/products/embedded_processors/developer/kirkwood/sheevaplug.jsp
http://www.openplug.org/

The SheevaPlug ( SHPG ) cost $100 in onesies and it runs Linux.
It has an ethernet port , an asynch serial port, a built in power  
adapter , a USB port ( 2.0 ).
This means you can tap the serial data from the RFID tags , you can  
connect a USB web camera and look at displays , you can drive a  
variety of displays , ...........
You can use a variety of software packages including Open CV ,  PHP,  
Python , C/C++ , Basic, Forth , Linux drivers, etc.

If you want to look at using the SHPG , I can give you some free help.


Gus
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