> According to the documentation the -D option makes 
httrack 
> crawl only to the child subdirectories of the URL 
> specified.
> However, I tried to download 
www.geocities.com/psylockecentral 

Try:
www.geocities.com/psylockecentral/
instead of www.geocities.com/psylockecentral
(notice th ending /)

If you mirror www.geocities.com/psylockecentral, the server 
will rediretc you to www.geocities.com/psylockecentral/ 
anyway .. but httrack will consider that you are starting 
from the www.geocities.com/ directory.