Had my 170 TDI Sportback for just over a month now. Done 1100 miles. I have done what i did to all of my cars i have had new (and never had major issues)
Drove steady for first 500 miles (neither rev hard or labour engine, avoid constant engine speeds for long periods of time)
500-1000 miles start to give it the beans every now and again, more often the closer to 1000 miles.
After 1000 miles - let rip!!
The most important thing, for this and any other car is that you make sure the engine is up to temperature before you rev it hard. Also you will be able to tell the difference later in the cars life when a car has been driven hard. It will feel better and more responsive - not saying it is faster though!!
Incidentially, my car doesn't appear to have used any oil in the first 1100 miles. Anyone else find this?