oceana

I know someone posted a very informative post about del.icio.us some time ago, which ironically I bookmarked and can't find anymore. Does anyone know which post I am talking about or can point me to other sites explaining how to best use del.icio.us?

I finally signed up for it, but I'm not sure if and how to use it. The two most urgent questions I have are:
1) Is there a way to make bookmarks private or is everything I have there automatically available to the public?
2) Is there a way to import bookmarks from my browser or do I have to transfer the roughly 1000 websites I have bookmarked by hand?

Help?