I take my Polo TDI to the red line every single day of its life (obviously dont drive everywhere at 4500rpm though!)
they need to be revved out, so don't be afraid.
for the record, I havent had any engine probs in 75,000kms and the engine is chipped too. I drive it sedately until its warm and then give it a work out in the first couple of gears every now and again.
Don't baby a new engine, drive it like you stole it!