Many breeds track. 
What I have found at the trials I have attended (which isn't many) is that almost any if not all breeds can track.  
The people that track seem to be very friendly and the track layers & the judges will share their knowledge. 
We can't wait for our girls to start trialling in 2011  
Here is another slide from Haddon earlier on in the year: 
http://ballarat.gsdcv.org.au/node/1299 
I will try and find the slide show from the Bendigo Trial & post it  in a while 
Cheers 
Noreen