Blogging: Del.icio.us and Teaching (and Categories?)

cbd offers an explanation of how Del.icio.us and teaching go together. I wish I could get my head around del.icio.us completely. It just evades me. There’s something I just don’t get. The way the cbd explains it here made me wonder if it wouldn’t be a way for me to have categories on my blog, which doesn’t really support categories. If I chose keywords that were my categories and then tagged things, could I create category links to those entries on del.icio.us? It feels like that would work, but there’s something that makes the whole del.icio.us thing feel too complex. I think I need to sit down with someone and have him/her walk me through a site till I get it. I’m not exactly sure who that person would be or where she/he is hiding. And while that miracle person is at it, I’ll take details on how all this compares to technorati.