Fastest high-speed communication between two LPC1768s?

Looking for opinions/answers on high-speed (in excess of 10Mbits/s) communication between to mbed LPC1768 processors, sitting right next to each other on a PCB board.

Obviously using the Ethernet port and wiring one to the other would potentially give me 100Mbits/s; however, are there other options? I might want to use the Ethernet port for networking.

However, if the Ethernet port is the only viable solution, is there an implementation that uses the LPC1768 Ethernet pins but does not use the RJ45 jack (requiring the development board)never tried to do Ethernet without a "connector."

Open to all suggestions except the go-to-hell one.

VR/JW

Testing reply

Ethernet is probably the only way you can do 10 mbit/s and higher. SPI could theoretically do it (but very close to theoretical max). You can look at crossover pinout to see how to connect without RJ45 jacks.