how to clean sys.path

[siggi]

Hi all,

when I do >>>sys.path in IDLE (winXP), i get a horrendously long list of 
paths, paths I may have used during a lot of trials and errors. How can I 
clean up sys.path? I mean, trim it of unnecessary paths?

So far, I know only the command >>>sys.path.append(r'c:....etc...'), but how 
to delete or insert at the beginning of the list, I know not.

Thanks,

siggi