Serial inputs

I am using the Duemilanove board and I have 2 different things that need the serial input, a GPS data stream, and a RF serial reciever to get commands from a computer. IS it possible to convert one of the other pins as a serial input?

Answer: It depends.

have a look at this

and see if it fits the bill.

This is a much less restrictive software serial.

http://arduiniana.org/libraries/newsoftserial/

Works a treat.