Teach me how to use del.icio.us effectively

I'm pretty good at SEO. I've built a large network of sites that make a very nice profit and place well in the search engines.

But I've gotta confess. I've never been able to crack the del.icio.us nut. How embarrassing, right? "And why the hell are you exposing your incompetencies when you're supposed to be establishing your expertise?"

Well, it's because I want to learn. And I'm not ashamed to admit that I (and everyone) has weaknesses.

The bottom line is that I want to master del.icio.us. I want to master it. I want to know the ins and outs. I want to know the secrets. I want to know how I can do everything possible to use del.icio.us for SEO.

So far I've failed. The next time I won't.

So who's going to help me? Who's going to reveal the secrets of;

1. Tagging
2. Getting other people to tag
3. Building links from del.icio.us
4. Getting traffic from del.icio.us

Be an expert. Provide me with the authoritative guide to using del.icio.us for SEO.