>I like the interrupt approach. I set a circular buffer
>that the application fills and the ISR empties. When
>transmitting the last char the ISR disables TXIE, and
>when queuing any char the application enables TXIF.
>
>Things become as simple as 'UARTSendByte( Port, Byte );'.
>
>Usually the application will never wait for the UART,
>unless the circular queue becomes full or I need to
>wait for the transmission to end
>(  'UARTIsTransmitting( Port )' ).

I have done exactly this using assembler on the 16F series, using Olins 
macros for the FIFO, and Fr. Tom McGahees PICUART file. Works a real treat. 

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