Ordered it from Mouser but you can buy from SiLabs, too.
The schematic shows that device as a resistor (R5, on the schematic) and calls out the value as 0.05R. It seems kind of useless to me. However, I like the idea of being able to monitor current pulled by the system and that is a pretty convenient spot when bus powered.
For what it's worth, my layout just ties shield to gnd. Well see when I get the board. I'm still fussing the design. Biggest question is whether to terminate various unused pins. Generally it's a good idea but the config software has some interactions that I don't understand. The miniEK leaves RI/CLK, DCD, DTR, DSR, GPIO.4, GPIO.5 and GPIO.6 unconnected. I'll assume those are fine to leave dangling. It takes RTS, GPIO.3, GPIO.4, chren, chr1, chr0, RXT, TXT, TXD and Suspend to the header. It's not clear what they expect to have done with them. (Some are pretty obvious, though). Once I get the miniEK I'll be able to figure it out.