> Can someone help me downloading sites with asp, and asp 
> authentication?> I tried to download www.dpchallenge.com
> and it didn't succeed... :(

Asp is not the problem, but authentication. See related 
threads in the forum (search "capture url"), which will 
suggest you to use the 'Add URL'/'Capture URL' feature of 
httrack. (which sometimes works, sometimes not, depending 
on the complexity of the website authentication)