Strangely, though, I managed to use pin 11! Is that possible?
Pin 11 is MOSI (Master Out/Slave In) and is only used when writing to the SD card. You can probably get away with using it if as long as you are only reading from the card.
I thought that the only pins unavailable were those occupied by connections required to put the wave shield up and runnin (2, 3, 4, 5 and 10)!
Those pins are configurable in software. SPI communication on pins 11, 12 and 13 is fixed in the Atmega328 processor hardware.
This is noted in the tutorial (second to last step): http://www.ladyada.net/make/waveshield/solder.html
Pins 13, 12 and 11 are used to talk to the SD card and cant be changed. The rest of the pins, however, are more flexible. Still, for all the examples on the site we'll be using this wiring, so it is suggested to just go with this.
2 -> LCS
3 -> CLK
4 -> DI
5 -> LAT
10 -> CCS
You can use any sort of wire. Solder the jumper wires in place.