I found this good explanation of the difference between tagging and categories.
Aaron Brazell says in his post “Tag, Your it! Leveraging Tagging for your blog,” that categories are structured and tags are unstructured.
“The main difference between categories and tags is the way they organize content. Categories use the “tree” style concept that is probably the easiest to envision. You may have a series of categories such as “News”, “Music”, “Tech” with subcategories nested under those categories. The News category might have subcategories like “Politics”, “Main Stream Media”, and “Iraq” and the Music category might have subcategories like “Melbourne Bands” or “CD Reviews”.
In this way, content is organized in a structural way. Every entry has a bucket to go in and in this way, content can be easily maintained.
However, tagging provides more of a granular way of organizing content and it follows more of a “brain storage” approach.”
http://www.problogger.net/archives/2006/02/27/tag-youre-it-leveraging-tagging-for-your-blog/
The tutorial for De.li.cious is pretty good – it tells me exactly how to use it to my advantage. I’ll try her directions for greenhouse gardening, colonial genealogy and maybe for my trip to Europe this fall. And of course for Library 2.0.
Me: Learning Library 2.0 
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