Finding new things in del.icio.us is a little bit like an egg hunt. The Tag Team releases a new feature, with no announcment, and then the community finds it.
So, if you haven't used the for: tag yet, don't feel bad.
Basically, if you want to send a link to another del.icio.us user, you tag it for:theirscreename. Now, I've used the "forchristina" tag in the past and had my mentee use it to get things, but this is much less of a hack. With the for: tag, you can send stuff directly to them and only get can see it. To retreive your own for: tags when you're signed in, just got to http://del.icio.us/for and it will automatically default to your own for: links. Plus, you can subscribe to your ow for: tag via RSS.
So, if anyone wants to send me a link, be it furniture for my apartment, cool events, companies of interest, etc. you can just tag it for:ceonyc and I'll get it.